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• GMail detecting mail as spam

  - by Petru Toader

  I've been trying for a long time to get our company's mail server send mail that will get accepted by the GMail spam filter. I have managed making it work for Yahoo Mail and Hotmail, sadly GMail is still marking our mails as spam. I have configured DKIM, SPF, DMARC and verified our mail server IP address against blacklists. I also have pasted here the headers GMail gets when we send a mail. Delivered-To: [email protected] Received: by 10.42.215.6 with SMTP id hc6csp107427icb; Wed, 20 Aug 2014 07:34:26 -0700 (PDT) X-Received: by 10.194.100.34 with SMTP id ev2mr59101019wjb.76.1408545265402; Wed, 20 Aug 2014 07:34:25 -0700 (PDT) Return-Path: <[email protected]> Received: from mail.phyramid.com (mail.phyramid.com. [178.157.82.23]) by mx.google.com with ESMTPS id dj10si4827754wib.79.2014.08.20.07.34.24 for <[email protected]> (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 20 Aug 2014 07:34:25 -0700 (PDT) Received-SPF: pass (google.com: domain of [email protected] designates 178.157.82.23 as permitted sender) client-ip=178.157.82.23; Authentication-Results: mx.google.com; spf=pass (google.com: domain of [email protected] designates 178.157.82.23 as permitted sender) [email protected]; dkim=pass [email protected] Received: from localhost (localhost [127.0.0.1]) by mail.phyramid.com (Postfix) with ESMTP id ED2BB2017AC for <[email protected]>; Wed, 20 Aug 2014 17:33:23 +0300 (EEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=phyramid.com; h= content-type:content-type:mime-version:x-mailer:subject:subject :message-id:to:from:from:date:date; s=dkim; t=1408545197; x= 1409409197; bh=e04RtoyF7G39lfCvA9LLhTz4nF64siZtN5IYmC18Xsc=; b=o +6mO8Uz4Uf1G4U2q6tKUiEy2N2n/5R2VtPPwIvBE5xzK/hEd2sDGMxVzQVgIDCsK Q0Xh+auPaQpxldQ+AEcL2XSZMrk/g0mJONjkpI19I5AwGIJCR1SVvxdecohTn9iR bCHzrGi2wAicfDBzOH6lUBNfh2thri79aubdCYc97U= X-Amavis-Modified: Mail body modified (using disclaimer) - mail.phyramid.com X-Virus-Scanned: Debian amavisd-new at mail.phyramid.com Received: from mail.phyramid.com ([127.0.0.1]) by localhost (mail.phyramid.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3JcgXZAXeFtX for <[email protected]>; Wed, 20 Aug 2014 17:33:17 +0300 (EEST) Received: from whiterock.local (unknown [109.98.21.30]) by mail.phyramid.com (Postfix) with ESMTPSA id 05CAE200280 for <[email protected]>; Wed, 20 Aug 2014 17:33:15 +0300 (EEST) Date: Wed, 20 Aug 2014 17:34:15 +0300 From: Company Mail <[email protected]> To: [email protected] Message-ID: <[email protected]> Subject: hey there! X-Mailer: Airmail (247) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline How was your summer? ---- Thanks a lot!

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• Preventing my postfix to send my local users spam

  - by Jack

  I have a postfix/dovecot mail server with 100 different users. When they send an email they need to be authenticated. I successfully use saslauth to achieve this. Few days ago I had a problem. One specific user, probably with a virus or a spam-bot installed in its computer, started to send out through my server thousands of emails in few hours. As result, my ip has been blocked by many isp provider (@aol, @yahoo, and others) and has been listed in many blacklist, making all my 100 users unable to send any email to anyone. What is the best practice to avoid this problem? It would be great if my server could recognize a spamming user and automatically block it. Also, have a limit of, say, 30 emails per hour could be a partial solution. Any idea how to face this problem? Thank you

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• Using procmail to remove backdated spam

  - by bugmenot77

  I started getting spam backdated by a few years. Is there an easy way to detect and divert these to /dev/null using procmail?

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• Best Practices and Etiquette for Setting up Email Notifications

  - by George Stocker

  If you were going to set up a Email Alerts for the customers of your website to subscribe to, what rules of etiquette ought to be followed? I can think of a few off the top of my head: Users can Opt-Out Text Only (Or tasteful Remote Images) Not sent out more than once a week Clients have fine-grained control over what they receive emails about (Only receive what they are interested in) What other points should I consider? From a programming standpoint, what is the best method for setting up and running email notifications? Should I use an ASP.NET Service? A Windows Service? What are the pitfalls to either? How should I log emails that are sent? I don't care if they're received, but I do need to be able to prove that I did or did not send an email.

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• My VPS cannot send email

  - by ifdion

  Webmaster Newbie Question I have a low end vps (128MB RAM)running on Debian.I used a bash script by ilevkov to setup the site. After some trial and error, I managed to set up a WordPress on it. Just now I found out that my VPS can't send any email. I tested using the WordPress reset password email, and it shows The e-mail could not be sent. Possible reason: your host may have disabled the mail() function... After some Google session I noticed that I can send email from ssh. So I tried mail [email protected] Subject: Halo dion some message . and the result said EOT /usr/lib/sendmail: No such file or directory "/root/dead.letter" 9/243 . . . message not sent. The question How can I fix my VPS mail setting?

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• Buying a parked domain if the contact email bounces

  - by Mala

  I'm trying to buy a domain which is parked, but the contact email address listed on the page itself bounces. I looked up the WHOIS data and there are no email addresses or phone numbers listed. There are way too many hits on facebook / linkedin to try just searching for the name. What recourses do I have to try to get into contact with the owner? UPDATE: Hosted on the same IP are 206 identical "parked" pages, whose sole difference is the domain and the email address (always "info@[domain].it"): http://www.bing.com/search?q=ip%3A151.1.48.220 Whois info shows contact information for none (that I sampled) but all with different names o_O

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• Sending email notifications to users

  - by Web Girl

  What is the preferable way to send email notifications to users? I can do it both ways but what is better? have some c# code that calls stored procedure in the database. Stored procedure based on some logic pulls all the emails data and sends email using database mail or c# code calls stored procedure, gets all the nesessary data back and sends email itself using smtp server etc. I just wonder what is the preferable way in the sense of performance etc... C# code is a library that would be a part of the web application. So it's where it's better to put the load, on the application server or the database server? System will not be crazy busy, it's not like Amazon or something. But still it would be nice to create something that makes sense.

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• Are there sources of email marketing data available?

  - by Gortron

  Are sources of email marketing data available to the public? I would like to see email marketing data to see what kind of content a business sends out, the frequency of sending, the number of people emailed, especially the resulting open rates and click through rates. Are businesses willing to share data on their previous email marketing campaigns without divulging their contact list? I would like to use this data to create an application to help businesses create better newsletters by using this data as a benchmark, basically sharing what works and what doesn't for each industry.

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• Looking for a simple to use email server that can be programmatically (preferably remotely) used

  - by sr2222

  I've been poking around the internet for much of the day, but I can't seem to find a good server to fit my needs. What I need is a simple to use and deploy (pref open source) lightweight email server that I can create users on programmaticly that has IMAP or POP support. I'd prefer something with an existing service interface, but if I have to write a REST API on top of an easy to use API, that's acceptable. The purpose of this tool will be to allow a test automation framework to create new email accounts and retrieve email sent to those addresses. I need text, html, and possibly attachment support as well. Perhaps it's my noobishness, but I can't really suss out the details from the documentation on the servers available out there to figure out which fit my needs.

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• How to Export Email "Sent" Folder?

  - by user249493

  A client had her web site and email hosted at "company A". She was switching to "company B" but didn't want to lose her email. I set up a Gmail account, POPed into her webmail account, and pulled the entire inbox into Gmail (for later transfer to her new host). But I forgot about the "sent" folder. Although the hosting plan is still up and running, she changed her domain record to point to the new host. So I can't access the old webmail account via POP or IMAP because the email address needed for authentication now resolves to the new host. Is there any way I can get the contents of the sent folder without having to do a "forward" one message at a time (there are hundreds)?

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• Allowing users to create an email address

  - by user532887

  I am creating a website and would like to allow users to create their own email forward. Basically, the site will allow groups to create pages on the site, each of which will be able to have its own domain name. I would like users to be able to automatically create an email address on the site that will forward any incoming emails to their own email account. Right now I have to manually set these up in my hosting account control panel but I'm hoping there is a way to do this automatically. Does anyone have experience with doing something similar?

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• Changing email application in Preferred Applications to GMail?

  - by grm

  I'm trying to change the Preferred Application for email. I have installed the package desktop-webmail, but there is no new option under System - Preferences - Preferred Application as you would expect, infact, there is only one option there, only Evolution. According to this post it should be possible to set a custom application, but no option is available. Is it possible to setup GMail as Preferred email app so that File - Send by email works in gnome apps? This seems to be a dup of another post here, Thing is that this works fine in 10.10, but in 11.04 this method no longer work. My post above is meant for 11.04 and the question is still valid.

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• Send bulk email from SQL Server 2008

  - by dbnewbie

  Hi, I am relatively new to databases,so please forgive me if my query sounds trivial. I need to send bulk email to all the contacts listed in a particular table. The body of the email is stored in a .doc file which begins as Dear Mr. _. The SQL server will read this file, append the last name of the contact in the blank space and send it to the corresponding email address for that last name. Any thoughts on how to proceed with this? Any insights,suggestions,tips will be greatly appreciated. Thanks!

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• Adding / Removing values for an Email based daily stock value reporter - made inPHP

  - by Dave

  Hi, i'm buidling a very simple email based website that users can, when registering list out all the stocktickers they're intersted in following. The program then on a daily basis goes and fetches that information and sends it out to every user. i have the portion which fetchs the information from the stock websites, but i'm looking for an "infrastructure" that allows: (a) a user to send an email to [email protected] with the subject "Subscribe" and with the body containing stockticker values, (b) user to send email to service@... with subject "unsubscribe" and body containing similar values. Looking for code in php please. Any insights?

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• Migrating email forwarding entries from DirectAdmin to Google App (Free edition)

  - by bobo

  I have a website hosted in a shared hosting account and it contains a DirectAdmin (DA) control panel. From there, I can see some email forwarding entries. I would like to migrate the email server to the Google App's, I am going to change the MX records to point to Google email server in the DA. For the existing email accounts that I see in the DA, I will re-create them in the Google App. But for those email forwarding entries, I am confused. If I keep them there, will they still work after I have changed the MX record pointing to the Google email server? If not, this means I will need to re-create them in the Google App, right? Unfortunately, Google App (Free edition) does not seem to allow email forwarding like those in DA. Unless I choose to use other editons (http://www.google.com/support/a/bin/answer.py?answer=175745). In DA, when I have created an email forwarding entry such as [email protected] - [email protected], I do not really need to create a dummy [email protected] email account and DA will still do the forwarding properly. The best I can do now, without upgrading the Google App edition, is to simply create dummy email accounts in the Google App and setup forwarding inside that email account, is this correct?

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• Postfix - am I sending spam?

  - by olrehm

  today I received like 30 messages within 5 minutes telling me that some mail I send could not be delivered, mostly to *.ru email addresses which I did not send any mail to. I have my own webserver (postfix/dovecot) set up using this guide (http://workaround.org/ispmail/lenny) but adjusted a little bit for Ubuntu. I tested whether I am an Open Relay which I am apparently not. Now there are two possible reasons for the above mentioned emails: Either I am sending out spam, or somebody wants me to think that, correct? How can I check this? I selected one particular address that I supposedly send spam to. Then I searched my mail.log for this entry. I found two blocks that record that somebody from the server connected to my server and delivered some message to two different users. I cannot find an entry reporting that anyone from my server send an email to that server. Does this mean its just some mail to scare me or could it still have been send by me in the first place? Here is one such block from the log (I replaced some confidential stuff): Jun 26 23:23:28 mycustomernumber postfix/smtpd[29970]: connect from mx.webstyle.ru[195.144.251.97] Jun 26 23:23:29 mycustomernumber postfix/smtpd[29970]: 044991528995: client=mx.webstyle.ru[195.144.251.97] Jun 26 23:23:29 mycustomernumber postfix/cleanup[29974]: 044991528995: message-id=<[email protected]> Jun 26 23:23:29 mycustomernumber postfix/qmgr[3369]: 044991528995: from=<>, size=2198, nrcpt=1 (queue active) Jun 26 23:23:29 mycustomernumber amavis[28598]: (28598-11) ESMTP::10024 /var/lib/amavis/tmp/amavis-20110626T223137-28598: <> -> <[email protected]> SIZE=2198 Received: from mycustomernumber.stratoserver.net ([127.0.0.1]) by localhost (rehmsen.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP for <[email protected]>; Sun, 26 Jun 2011 23:23:29 +0200 (CEST) Jun 26 23:23:29 mycustomernumber amavis[28598]: (28598-11) Checking: YakjkrdFq6A8 [195.144.251.97] <> -> <[email protected]> Jun 26 23:23:29 mycustomernumber postfix/smtpd[29970]: disconnect from mx.webstyle.ru[195.144.251.97] Jun 26 23:23:29 mycustomernumber amavis[28598]: (28598-11) lookup_sql_field(id) (WARN: no such field in the SQL table), "[email protected]" result=undef Jun 26 23:23:32 mycustomernumber postfix/smtpd[29979]: connect from localhost.localdomain[127.0.0.1] Jun 26 23:23:32 mycustomernumber postfix/smtpd[29979]: 0A1FA1528A21: client=localhost.localdomain[127.0.0.1] Jun 26 23:23:32 mycustomernumber postfix/cleanup[29974]: 0A1FA1528A21: message-id=<[email protected]> Jun 26 23:23:32 mycustomernumber postfix/qmgr[3369]: 0A1FA1528A21: from=<>, size=2841, nrcpt=1 (queue active) Jun 26 23:23:32 mycustomernumber postfix/smtpd[29979]: disconnect from localhost.localdomain[127.0.0.1] Jun 26 23:23:32 mycustomernumber amavis[28598]: (28598-11) FWD via SMTP: <> -> <[email protected]>,BODY=7BIT 250 2.0.0 Ok, id=28598-11, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 0A1FA1528A21 Jun 26 23:23:32 mycustomernumber amavis[28598]: (28598-11) Passed CLEAN, [195.144.251.97] [195.144.251.97] <> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: YakjkrdFq6A8, Hits: 2.249, size: 2197, queued_as: 0A1FA1528A21, 2882 ms Jun 26 23:23:32 mycustomernumber postfix/smtp[29975]: 044991528995: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.3, delays=0.39/0.01/0.01/2.9, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=28598-11, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 0A1FA1528A21) Jun 26 23:23:32 mycustomernumber postfix/qmgr[3369]: 044991528995: removed Jun 26 23:23:33 mycustomernumber postfix/smtp[29980]: 0A1FA1528A21: to=<[email protected]>, orig_to=<[email protected]>, relay=mx3.hotmail.com[65.54.188.110]:25, delay=1.2, delays=0.15/0.02/0.51/0.55, dsn=2.0.0, status=sent (250 <[email protected]> Queued mail for delivery) Jun 26 23:23:33 mycustomernumber postfix/qmgr[3369]: 0A1FA1528A21: removed Jun 26 23:26:49 mycustomernumber postfix/anvil[29972]: statistics: max connection rate 1/60s for (smtp:195.144.251.97) at Jun 26 23:23:28 Jun 26 23:26:49 mycustomernumber postfix/anvil[29972]: statistics: max connection count 1 for (smtp:195.144.251.97) at Jun 26 23:23:28 Jun 26 23:26:49 mycustomernumber postfix/anvil[29972]: statistics: max cache size 1 at Jun 26 23:23:28 I can provide more info if you tell me what you need to know. Thank you for you help!

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• Shortcut key to forward email to fixed email address in Postbox

  - by Jos v.d. Voort v.d. Kleij

  As an avid user of todo apps (currently Asana) is very much miss a way to easily forward an email from Postbox to my GTD app. Currently the workflow is: Click cmd/L to open the forward email window Type [email protected] in the To: address field Click the send button in the forward email window What I would like to have is an automator or applescript that does that for me. Ex: Highligh/select the mail I wish to convert to a task in Asana and the type a shortcut like ctrl/cmd/L to forward the mail to Asana. As most todo apps have custom email addresses you can use to convert an email into a task, the only thing that needs to be changed is the email address in the script. For Asana this would not be necessary because the email address for converting an email into a taks is the same for all Asana users.

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• Spam or exchange issue?

  - by John

  I am getting an error message to unknow user on my domain. I would like to know is this just a phishing spam email or it was really send from our domain? I have changed our domain name to OURDOMAIN.COM I have Exchange 2010 installed. Body of the email is Delivery has failed to these recipients or distribution lists: sales The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator. Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators: Generating server: murraygroup.local [email protected] #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## Original message headers: Received: from ironport.mih.co.uk (10.10.29.9) by mih-exca-01.murraygroup.local (10.10.29.133) with Microsoft SMTP Server id 8.3.106.1; Fri, 29 Jun 2012 12:36:12 +0100 Received: from glamf04.netintelligence.com (HELO mailfilter.iomart.com) ([62.128.193.114]) by ironport.mih.co.uk with SMTP; 29 Jun 2012 12:42:48 +0100 Received: from glamta4.netintelligence.com(localhost.localdomain[127.0.0.1]) by mailfilter.iomart.com ; Fri, 29 Jun 2012 12:37:18 BST Received: from [195.43.137.66] ([195.43.137.66]) by glamta4.netintelligence.com (8.13.1/8.12.8) with ESMTP id q5TBbH4j022142 for <[email protected]>; Fri, 29 Jun 2012 12:37:18 +0100 Date: Fri, 29 Jun 2012 12:37:17 +0100 Message-ID: <20120629145229.4C2A817231D8A7958044@SONW> From: Ines Hampton <[email protected]> To: sales <[email protected]> Reply-To: Marguerite Soto <[email protected]> Subject: User sales MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-Path: [email protected] eporting-MTA: dns;murraygroup.local Received-From-MTA: dns;ironport.mih.co.uk Arrival-Date: Fri, 29 Jun 2012 11:36:12 +0000 Final-Recipient: rfc822;[email protected] Action: failed Status: 5.1.1 Diagnostic-Code: smtp;550 5.1.1 RESOLVER.ADR.RecipNotFound; not found X-Display-Name: sales

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• sending email with gmail smtp with codeigniter email library

  - by bohemian

  class Email extends Controller { function Email() { parent::Controller(); $this->load->library('email'); } function index() { $config['protocol'] = 'smtp'; $config['smtp_host'] = 'ssl://smtp.gmail.com'; $config['smtp_port'] = '465'; $config['smtp_timeout'] = '7'; $config['smtp_user'] = '[email protected]'; $config['smtp_pass'] = '*******'; $config['charset'] = 'utf-8'; $config['newline'] = "\r\n"; $config['mailtype'] = 'text'; // or html $config['validation'] = TRUE; // bool whether to validate email or not $this->email->initialize($config); $this->email->from('[email protected]', 'myname'); $this->email->to('[email protected]'); $this->email->subject('Email Test'); $this->email->message('Testing the email class.'); $this->email->send(); echo $this->email->print_debugger(); $this->load->view('email_view'); } } I am getting this error A PHP Error was encountered Severity: Warning Message: fsockopen() [function.fsockopen]: unable to connect to ssl://smtp.gmail.com:465 (Connection timed out) Filename: libraries/Email.php Line Number: 1641 Using PORT 25/587 I got this error """A PHP Error was encountered Severity: Warning Message: fsockopen() [function.fsockopen]: SSL operation failed with code 1. OpenSSL Error messages: error:140770FC:SSL routines:func(119):reason(252) Filename: libraries/Email.php Line Number: 1641"""" I dont want to use phpmailer now. (Actually i have tried to use phpmailer,but i falied ) How to solve this problems,guys?

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• What comment-spam filtering service works?

  - by Charles Stewart

  From an answer I gave to another question: There are comment filtering services out there that can analyse comments in a manner similar to mail spam filters (all links to the client API page, organised from simplest API to most complex): Steve Kemp (again) has an xml-rpc-based comment filter: it's how Debian filters comments, and the code is free software, meaning you can run your own comment filtering server if you like; There's Akismet, which is from the WordPress universe; There's Mollom, which has an impressive list of users. It's closed source; it might say "not sure" about comments, intended to suggest offering a captcha to check the user. For myself, I'm happy with offline by-hand filtering, but I suggested Kemp's service to someone who had an underwhelming experience with Mollom, and I'd like to pass on more reports from anyone who has tried these or other services.

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• sendmail rules for filtering spam

  - by user71061

  Hi! Can anyone help me with constructing sendmail rules for limiting spam? Assuming that name of my domain is my.domain.com, I want to use following rules: If BOTH sender and recipient address is from my.domain.com, message should be rejected (sendmail server only relays messages between my internal exchange server and outside word, so sending messages between users from my.domain.com always occour on exchange server and never on sendmail server) If recipient list contains AT LAST ONE invalid address, whole message should be rejected (even for valid recipients addresses) If sending server uses HELO message with bogus domain name (other than domain of this server), message should be rejected Any server attempting to send mail to dedicated address (f.e. [email protected]), should be automatically blacklisted Any other suggested rules ...

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• My sendmail sends spam and I can't identify which script sends it

  - by Andrew

  I've noticed one of my server is sending mass spam. The messages are like the one below (sending from: [email protected]). I've deleted USER_ACCOUNT but I'd like to know how can I identify the script (probably a hacked PHP script) that sends the mass mail considering this server hosts numerous websites. I0/83/968855 Mreturntosender: cannot select queue for postmaster: Broken pipe Fbn $_Unknown UID 1008@localhost ${daemon_flags}c u SUSER_ACCOUNT [email protected] H?P?Return-Path: <?g> H??Received: (from Unknown UID 1008@localhost) by benedictus.MYDOMAIN.COM (8.14.3/8.14.3/Submit) id q5H8Bx9A066412; Sun, 17 Jun 2012 11:11:59 +0300 (EEST) (envelope-from USER_ACCOUNT) H?D?Date: Sun, 17 Jun 2012 11:11:59 +0300 (EEST) H?M?Message-Id: <[email protected]> H??From: Tiffany June <[email protected]> H??To: "Fernando" <[email protected]> H??Subject: Tiffany June ADDED YOU to her Private Wish List H??MIME-Version: 1.0 H??Content-Type: multipart/related; boundary="=_8b944d33596415b2dd4371ef94e08aee

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• Which email client works best with GMail IMAP?

  - by Ivan

  I use GMail (and I use labels intensively) and because of having to use a very slow Internet connection now I've came to the idea that I should try using a desktop email client. What application (Thunderbird, Evolution, Claws, or some another) works best with GMail via IMAP? First of all I want correct GMail labels support (for example an email client shouldn't think of GMail labels as of independent folders, treating messages with multiple labels as multiple different identical messages in different folders), incl. special GMail labels-folders like bin, spam, drafts and sent.

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• integrating two systems through email

  - by Martin

  I want to integrate our bug tracker system and our Support system through emails. The bug tracker can kick out an email on every change to bugs/features. I want to download those emails, parse them and create a formatted email that the Support system can understand (ie the subject could be "Issue #4128 fixed"). What is the simplest way to accomplish this using C++ or C#?

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• How to implement an email unsubscribe system for a site with many kinds of emails?

  - by Mike Liu

  I'm working on a website that features many different types of emails. Users have accounts, and when logged in they have access to a setting page that they can use to customize what types of emails they receive. However, I'd like to also give users an easy way to unsubscribe directly in the emails they receive. I've looked into list unsubscribe headers as well as creating some type of one click link that would unsubscribe a user from that type of email without requiring login or further action. The later would probably require me to break convention and make changes to the database in response to a GET on the link. However, am I incorrect in thinking that either of these would require me to generate and permanently store a unique identifier in my database for every email I ever send, really complicating email delivery? Without that, I'm not sure how I would be able to uniquely identify a user and a type of email in order to change their email preferences, and this identifier would need to be stored forever as a user could have an email sitting in their inbox for a long time before they decide to act on it. Alternatively, I was considering having a no-login page for managing email preferences. In contrast to above where I would need one of these identifiers for each email, this would only need one identifier per user, with no generation or other action required on sending an email. All of these raise security issues, and they could potentially be used by people to tamper with others' email preferences. This could be mitigated somewhat by ensuring that the identifier is really difficult to guess. For the once per user identifier approach, I was considering generating the identifier by passing a user's ID through some type of encryption algorithm, is this a sound approach? For the per-email identifiers, perhaps I could use a user's ID appended to the time. However, even this would not eliminate the problem entirely, as this would really just be security through obscurity, and anyone with the URL could tamper, and in the end the main defense would have to be that most people aren't so bored as to tamper with other people's email preferences. Are there any other alternatives I've missed, or issues or solutions with these that anyone can provide insight on? What are best practices in this area?

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