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• SSMTP to forward root@localhost mail

  - by Redconnection

  I would like to forward mail that gets sent root@localhost on multiple servers to our company admin account (e-mail is hosted on gmail) I have installed ssmtp on centos 5.5 via yum and configured it. i've also changed the last line in /etc/aliases to reflect where mail to root should go to. I've then tried sending mail to root - this gets delivered without a problem (mail -v root) I've also tried sending mail to root@localhost - this is not delivered to the specified gmail account.

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• mail takes too much time to send emails, why?

  - by Vincenzo

  I'm sending emails by PHP method mail() and every time it takes 20-40 seconds to produce a result. Looks like my server (sendmail) is configured to synchronous sending of emails. That's why the PHP script has to wait.. How can I fix it? Thanks!

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• Outlook: Automatically set from address when replying

  - by mark

  I have a dozen forwarders sending into a gmail account, I have outlook setup using imap but when I reply I don't want it sending from the Gmail address, instead I want it to come from one of the addresses it was forwarded to. I know I can set the from address manually by accessing the email's options when writing a new email, but this is going to be forgotten by the users and they are bound to mess it up, I need a way that I can send as some of the forwarded addresses automatically, any ideas?

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• How to debug packet loss ?

  - by Gene Vincent

  I wrote a C++ application (running on Linux) that serves an RTP stream of about 400 kbps. To most destinations this works fine, but some destinations expericence packet loss. The problematic destinations seem to have a slower connection in common, but it should be plenty fast enough for the stream I'm sending. Since these destinations are able to receive similar RTP streams for other applications without packet loss, my application might be at fault. I already verified a few things: - in a tcpdump, I see all RTP packets going out on the sending machine - there is a UDP send buffer in place (I tried sizes between 64KB and 300KB) - the RTP packets mostly stay below 1400 bytes to avoid fragmentation What can a sending application do to minimize the possibility of packet loss and what would be the best way to debug such a situation ?

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• Asynchronous email processing in Java web application

  - by Denise

  Hi everyone, I would like to implement asynchronous email sending in my web application when users register for a new account. This is so that if there is a problem or delay in sending the email message (e.g. the mail server is down or the network connection to the mail server is slow) the user won't be kept waiting for the sending to complete. My web app is built using Spring and Hibernate's implementation of JPA. What would be the best and most reliable way for me to implement asynchronous email processing in this web application? I am thinking about persisting the email information in a database table which is then regularly polled by a Quartz (http://www.opensymphony.com/quartz/) scheduled job for updates and when it finds new unsent emails, it attempts to send them. Is this a reasonable way of implementing what I want? Thanks.

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• Balanced File Distribution from server to client

  - by Abhinav

  To design a client-server code in LINUX where server will send the file equally to its entire client connected(all not at a time). Suppose 15 files are there, client1 makes a connection, server starts sending files to it. After 4 files a new connection comes the first client gets halted (not terminated) and client2 start getting the file. After 2 files another connection comes. Server starts sending file to client3. after sending 3[2(client2)+1] files, server resumes client2.then client2 & client3 goes on till file count reaches 4.then client1 wakeup & remaining 3 files are transferred to each 3 clients. File's name are pre written in a file from where server reads it(not a big deal)

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• Problem with sendkeys in .NET

  - by AvidProgrammer

  I have a windows application, where I am using send keys to navigate from one window to another. My send key sequence is like activating another window with in my app, and sending key strokes to that window. But the key strokes I am sending is getting updated in the same window where I am activating the other window. But after few key strokes it is going to the other window. Seems like synchonization issue with send keys. Is there a way to specify the operation of the current send key is finished, before sending the next sendkey.

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• Is it possible to send an automated email with dynamic content in Rails

  - by Danny McClelland

  Hi Everyone, I am looking into the best way of doing the following: I have a model called Kase, and when a user creates a new case then are taken to the show view as you would expect. I am trying to work out what the best way of sending an automated email between those two events is. I would need to include in the email the content of a couple of the fields, ideally I am looking for a way of just typing out the email and adding the same snippets that are in the show view for each of the fields I need. I am using the Base App from Github so the email sending is already setup for the user authentication and registration, but I'm not sure where to begin. The reason I want to send the email is to create a new Case in our Highrise account, and I don't have a clue how to use the API. So I think the email sending is the easier way. Thanks, Danny

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• Activity ignore intent's extra fields

  - by ced

  For example, In an ActivityA there's a button to create an Intent that will start ActivityB in a new task, like this: Intent i = new Intent(this, ActivityB.class); i.setData(Uri.parse("http://www.google.com")); long timestamp = System.currentTimeMillis(); i.putExtra("ts", timestamp); i.addFlag(Intent.FLAG_ACTIVITY_NEW_TASK); Log.d(TAG, "Sending: " + timestamp); startActivity(i); Then in ActivityB's onResume() method, there's this code to check the timestamp: long timestamp = getIntent().getExtras().getLong("ts"); Log.d(TAG, "Receiving: " + timestamp); Now the first time I invoke ActivityB from ActivityA I get the following logs: Sending: 120006000 Receiving: 120006000 Then if I left ActivityB running in the background (by pressing Home button), and start ActivityA then invoke ActivityB again, the following is printed: Sending: 120013000 Receiving: 120006000 It seems although ActivityB is brought to front by the new Intent. The extra field in the intent is being left behind. Is this a bug or an intended behavior?

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• Parent Thread exiting before Child Threads [python]

  - by crgwbr

  I'm using Python in a webapp (CGI for testing, FastCGI for production) that needs to send an occasional email (when a user registers or something else important happens). Since communicating with an SMTP server takes a long time, I'd like to spawn a thread for the mail function so that the rest of the app can finish up the request without waiting for the email to finish sending. I tried using thread.start_new(func, (args)), but the Parent return's and exits before the sending is complete, thereby killing the sending process before it does anything useful. Is there anyway to keep the process alive long enough for the child process to finish?

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• send() always interrupted by EPIPE

  - by Manuel Abeledo

  I've this weird behaviour in a multithreaded server programmed in C under GNU/Linux. While it's sending data, eventually will be interrupted by SIGPIPE. I managed to ignore signals in send() and treat errno after each action because of it. So, it has two individual sending methods, one that sends a large amount of data at once (or at least tries to), and another that sends a nearly similar amount and slices it in little chunks. Finally, I tried with this to keep it sending data. do { total_bytes_sent += send(client_sd, output_buf + total_bytes_sent, output_buf_len - total_bytes_sent, MSG_NOSIGNAL); } while ((total_bytes_sent < output_buf_len) && (errno != EPIPE)); This ugly piece of code does its work in certain situations, but not always. I'm pretty sure it's not a hardware or ISP problem, as this server is running in six european servers, four in Germany and two in France. Any ideas? Thanks in advance.

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• Sonicwall VPN, Domain Controller Issues

  - by durilai

  I am trying to get the domain logon script to execute when I connect to VPN. I have a SonicWall 4060PRO, with the SonicOS Enhanced 4.2.0.0-10e. The VPN connects successfully, but the script does not execute. I am posting the log below, but I see two issues. The first is the inability to connect to domain. 2009/12/18 19:49:53:457 Information XXX.XXX.XXX.XXX NetGetDCName failed: Could not find domain controller for this domain. The second is the failure of the script. 2009/12/18 19:49:53:466 Warning XXX.XXX.XXX.XXX Failed to execute script file \DT-WIN7netlogondomain.bat, Last Error: The network name cannot be found.. I assume the second issue is caused because of the first, also on the second issue it seems to be trying to get the logon script from my local PC, not the server. Finally, the DC can be pinged and reached by its computer name once the VPN is connected. The shares that the script is tring to map can be mapped manually. Any help is appreciated. 2009/12/18 19:49:31:063 Information The connection "GroupVPN_0006B1030980" has been enabled. 2009/12/18 19:49:32:223 Information XXX.XXX.XXX.XXX Starting ISAKMP phase 1 negotiation. 2009/12/18 19:49:32:289 Information XXX.XXX.XXX.XXX Starting aggressive mode phase 1 exchange. 2009/12/18 19:49:32:289 Information XXX.XXX.XXX.XXX NAT Detected: Local host is behind a NAT device. 2009/12/18 19:49:32:289 Information XXX.XXX.XXX.XXX The SA lifetime for phase 1 is 28800 seconds. 2009/12/18 19:49:32:289 Information XXX.XXX.XXX.XXX Phase 1 has completed. 2009/12/18 19:49:32:336 Information XXX.XXX.XXX.XXX Received XAuth request. 2009/12/18 19:49:32:336 Information XXX.XXX.XXX.XXX XAuth has requested a username but one has not yet been specified. 2009/12/18 19:49:32:336 Information XXX.XXX.XXX.XXX Sending phase 1 delete. 2009/12/18 19:49:32:336 Information XXX.XXX.XXX.XXX User authentication information is needed to complete the connection. 2009/12/18 19:49:32:393 Information An incoming ISAKMP packet from XXX.XXX.XXX.XXX was ignored. 2009/12/18 19:49:36:962 Information XXX.XXX.XXX.XXX Starting ISAKMP phase 1 negotiation. 2009/12/18 19:49:37:036 Information XXX.XXX.XXX.XXX Starting aggressive mode phase 1 exchange. 2009/12/18 19:49:37:036 Information XXX.XXX.XXX.XXX NAT Detected: Local host is behind a NAT device. 2009/12/18 19:49:37:036 Information XXX.XXX.XXX.XXX The SA lifetime for phase 1 is 28800 seconds. 2009/12/18 19:49:37:036 Information XXX.XXX.XXX.XXX Phase 1 has completed. 2009/12/18 19:49:37:094 Information XXX.XXX.XXX.XXX Received XAuth request. 2009/12/18 19:49:37:100 Information XXX.XXX.XXX.XXX Sending XAuth reply. 2009/12/18 19:49:37:110 Information XXX.XXX.XXX.XXX Received initial contact notify. 2009/12/18 19:49:37:153 Information XXX.XXX.XXX.XXX Received XAuth status. 2009/12/18 19:49:37:154 Information XXX.XXX.XXX.XXX Sending XAuth acknowledgement. 2009/12/18 19:49:37:154 Information XXX.XXX.XXX.XXX User authentication has succeeded. 2009/12/18 19:49:37:247 Information XXX.XXX.XXX.XXX Received request for policy version. 2009/12/18 19:49:37:253 Information XXX.XXX.XXX.XXX Sending policy version reply. 2009/12/18 19:49:37:303 Information XXX.XXX.XXX.XXX Received policy change is not required. 2009/12/18 19:49:37:303 Information XXX.XXX.XXX.XXX Sending policy acknowledgement. 2009/12/18 19:49:37:303 Information XXX.XXX.XXX.XXX The configuration for the connection is up to date. 2009/12/18 19:49:37:377 Information XXX.XXX.XXX.XXX Starting ISAKMP phase 2 negotiation with 10.10.10.0/255.255.255.0:BOOTPC:BOOTPS:UDP. 2009/12/18 19:49:37:377 Information XXX.XXX.XXX.XXX Starting quick mode phase 2 exchange. 2009/12/18 19:49:37:472 Information XXX.XXX.XXX.XXX The SA lifetime for phase 2 is 28800 seconds. 2009/12/18 19:49:37:472 Information XXX.XXX.XXX.XXX Phase 2 with 10.10.10.0/255.255.255.0:BOOTPC:BOOTPS:UDP has completed. 2009/12/18 19:49:37:896 Information Renewing IP address for the virtual interface (00-60-73-4C-3F-45). 2009/12/18 19:49:40:189 Information The virtual interface has been added to the system with IP address 10.10.10.112. 2009/12/18 19:49:40:319 Information The system ARP cache has been flushed. 2009/12/18 19:49:40:576 Information XXX.XXX.XXX.XXX NetWkstaUserGetInfo returned: user: Dustin, logon domain: DT-WIN7, logon server: DT-WIN7 2009/12/18 19:49:53:457 Information XXX.XXX.XXX.XXX NetGetDCName failed: Could not find domain controller for this domain. 2009/12/18 19:49:53:457 Information XXX.XXX.XXX.XXX calling NetUserGetInfo: Server: , User: Dustin, level: 3 2009/12/18 19:49:53:460 Information XXX.XXX.XXX.XXX NetUserGetInfo returned: home dir: , remote dir: , logon script: 2009/12/18 19:49:53:466 Warning XXX.XXX.XXX.XXX Failed to execute script file \DT-WIN7netlogondomain.bat, Last Error: The network name cannot be found..

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• What to send to server in real time FPS game?

  - by syloc

  What is the right way to tell the position of our local player to the server? Some documents say that it is better to send the inputs whenever they are produced. And some documents say the client sends its position in a fixed interval. With the sending the inputs approach: What should I do if the player is holding down the direction keys? It means I need to send a package to the server in every frame. Isn't it too much? And there is also the rotation of the player from the mouse input. Here is an example: http://www.gabrielgambetta.com/fpm_live.html What about sending the position in fixed interval approach. It sends too few messages to the server. But it also reduces responsiveness. So which way is better?

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• Import and Export data from SQL Server 2005 to XL Sheet

  - by SAMIR BHOGAYTA

  For uploading the data from Excel Sheet to SQL Server and viceversa, we need to create a linked server in SQL Server. Expample linked server creation: Before you executing the below command the excel sheet should be created in the specified path and it should contain the name of the columns. EXEC sp_addlinkedserver 'ExcelSource2', 'Jet 4.0', 'Microsoft.Jet.OLEDB.4.0', 'C:\Srinivas\Vdirectory\Testing\Marks.xls', NULL, 'Excel 5.0' Once you executed above query it will crate linked server in SQL Server 2005. The following are the Query from sending the data from Excel sheet to SQL Server 2005. INSERT INTO emp SELECT * from OPENROWSET('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;Database=C:\text.xls','SELECT * FROM [sheet1$]') The following query is for sending the data from SQL Server 2005 to Excel Sheet. insert into OPENROWSET('Microsoft.Jet.OLEDB.4.0', 'Excel 8.0;Database=c:\text.xls;', 'SELECT * FROM [sheet1$]') select * from emp

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• Models, controllers, and code reuse

  - by user11715

  I have a blog where users can post comments. When creating a comment, various things happen: creating the comment object, associations, persisting sending notification emails to post's author given his preferences sending notification to moderators given their preferences updating a fulltext database for search ... I could put all this in the controller, but what if I want to reuse this code ? e.g. I would like to provide an API for posting comments. I could also put this in the model, but I wonder if I won't lose flexibility by doing so. And would it be acceptable to do all of this from the model layer ? What would you do ?

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• Web-Cam SecureChat

  This article will explain how to create a simple chat program using this remoting technology, which supports web-cam and sending files.

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• Postfix and tmpfs for /var/spool

  - by Rob Fisher

  My main disk is an SSD so in order to preserve its lifetime by reducing writes I followed some advice and made /var/spool a ram disk by adding this line to /etc/fstab: tmpfs /var/spool tmpfs defaults,noatime,mode=1777 0 0 Later I configured postfix because I have a RAID array on my system and mdadm wants to send me email if the RAID array fails which sounds like a fine idea. Email sending worked fine until I rebooted, at which point: postfix: fatal: open /etc/postfix-out/main.cf: No such file or directory The fix for this is apparently: mkdir /var/spool/postfix postfix check Then I found I also had to do: mkfifo /var/spool/postfix/public/pickup service postfix restart Now sending emails works fine...until the next reboot. So: what is the most correct way to recreate the contents of /var/spool/postfix automatically at boot time if it does not exist? I am using Ubuntu Server 12.04.

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• How should I report this problem?

  - by Sinan Aykut

  I use Ubuntu 11.04 Alpha in daily use and yesterday I've made an upgrade (apt-get dist-upgrade) after restart, I could not access to the desktop. Just the wallpaper and cursor... I've tried to open it in safe mode, but no luck. Before sending a bug report for this problem, Id like to know some things: 1) Which logs I should consider before sending a bug report? I think this issue is related to updated X.org or Unity desktop files 2) Is there any CLI way to turn my Unity desktop back to the classic one? Thanks.

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• ASP.NET: Using pickup directory for outgoing e-mails

  - by DigiMortal

  Sending e-mails out from web applications is very common task. When we are working on or test our systems with real e-mail addresses we don’t want recipients to receive e-mails (specially if we are using some subset of real data9. In this posting I will show you how to make ASP.NET SMTP client to write e-mails to disc instead of sending them out. SMTP settings for web application I have seen many times the code where all SMTP information is kept in app settings just to read them in code and give to SMTP client. It is not necessary because we can define all these settings under system.web => mailsettings node. If you are using web.config to keep SMTP settings then all you have to do in your code is just to create SmtpClient with empty constructor. var smtpClient = new SmtpClient(); Empty constructor means that all settings are read from web.config file. What is pickup directory? If you want drastically raise e-mail throughput of your SMTP server then it is not very wise plan to communicate with it using SMTP protocol. it adds only additional overhead to your network and SMTP server. Okay, clients make connections, send messages out and it is also overhead we can avoid. If clients write their e-mails to some folder that SMTP server can access then SMTP server has e-mail forwarding as only resource-eager task to do. File operations are way faster than communication over SMTP protocol. The directory where clients write their e-mails as files is called pickup directory. By example, Exchange server has support for pickup directories. And as there are applications with a lot of users who want e-mail notifications then .NET SMTP client supports writing e-mails to pickup directory instead of sending them out. How to configure ASP.NET SMTP to use pickup directory? Let’s say, it is more than easy. It is very easy. This is all you need. <system.net>   <mailSettings>     <smtp deliveryMethod="SpecifiedPickupDirectory">       <specifiedPickupDirectory pickupDirectoryLocation="c:\temp\maildrop\"/>     </smtp>   </mailSettings> </system.net> Now make sure you don’t miss come points: Pickup directory must physically exist because it is not created automatically. IIS (or Cassini) must have write permissions to pickup directory. Go through your code and look for hardcoded SMTP settings. Also take a look at all places in your code where you send out e-mails that there are not some custom settings used for SMTP! Also don’t forget that your mails will be written now to pickup directory and they are not sent out to recipients anymore. Advanced scenario: configuring SMTP client in code In some advanced scenarios you may need to support multiple SMTP servers. If configuration is dynamic or it is not kept in web.config you need to initialize your SmtpClient in code. This is all you need to do. var smtpClient = new SmtpClient(); smtpClient.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory; smtpClient.PickupDirectoryLocation = pickupFolder; Easy, isn’t it? i like when advanced scenarios end up with simple and elegant solutions but not with rocket science. Note for IIS SMTP service SMTP service of IIS is also able to use pickup directory. If you have set up IIS with SMTP service you can configure your ASP.NET application to use IIS pickup folder. In this case you have to use the following setting for delivery method. SmtpDeliveryMethod.PickupDirectoryFromIis You can set this setting also in web.config file. <system.net>   <mailSettings>     <smtp deliveryMethod="PickupDirectoryFromIis" />   </mailSettings> </system.net> Conclusion Who was still using different methods to avoid sending e-mails out in development or testing environment can now remove all the bad code from application and live on mail settings of ASP.NET. It is easy to configure and you have less code to support e-mails when you use built-in e-mail features wisely.

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• How can I refactor client side functionality to create a product line-like generic design?

  - by Nupul

  Assume the following situation similar to that of Stack Overflow: I have a system with a front-end that can perform various manipulations on the data (by sending messages to REST back-end): Posting Editing and deleting Adding labels and tags Now in the first version we created it well modularized but the need as of now for 'evolving' the system similar to Stack Overflow. My question is how best to separate the commonality and how to incorporate the variability with respect to the following: Commonality: The above 'functionalities' and sending/receiving the data from the server Look and feel (also a variability as explained below) HTTP verbs associated with the above actions Variability: The RESTful URLs where the requests are sent The text/style of the UI (the commonality is analogous to Stack Overflow - the functionality of upvotes, posting a question remains the same, but the words, the icons, the look and feel is still different across sites) I think this is entirely a client-side code organization/refactoring issue. I'm heavily using jQuery, javascript and backbone for front-end development. My question is how best should I isolate the same to be able to create multiple such aspects to the tool we are currently working on?

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• Boss solution vs Developer solution

  - by mahen23

  The problem: When we were sending newsletters to customers, there was no way to confirm if the customer already received the mail. So the boss decided to implement this idea: Boss's Idea: Each time mail was being sent, do an INSERT in a db with the title of the newsletter being sent and the email address which is receving the email address. To ensure that any email address does not receive the same email twice, do a SELECT in the table and find the title of the newsletter being sent: if (title of newsletter is found) { check to see of the email we are sending mail to is already present. if it does, do not send mail } else { send mail } MY idea: create a column called unique and mark it as UNIQUE. Each time mail was being sent, concatenate email + newsletter id and record it in the UNIQUE row. The next time we do a "mysql_affected_rows" check to see if our INSERT was successful, we send the mail, else, there is already a duplicate and no need to send it.

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• Moving AI in a multiplayer game

  - by Smallbro

  I've been programming a multiplayer game and its coming together very nicely. It uses both TCP and UDP (UDP for movement and TCP for just about everything else). What I was wondering was how I would go about sending multiple moving AI without much lag. At first I used TCP for everything and it was very slow when people moved. I'm currently using a butchered version of this http://corvstudios.com/tutorials/udpMultiplayer.php for my movement system and I'm wondering what the best method of sending AI movements is. By movements I mean the AI chooses left/right/up/down and the player can see this happening. Thanks.

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• In which object should I implement wait()/notify()?

  - by Christopher Francisco

  I'm working in an Android project with multithreading. Basically I have to wait to the server to respond before sending more data. The data sending task is delimited by the flag boolean hasServerResponded so the Thread will loop infinitely without doing anything until the flag becomes true. Since this boolean isn't declared as volatile (yet), and also looping without doing anything wastes resources, I thought maybe I should use AtomicBoolean and also implement wait() / notify() mechanism. Should I use the AtomicBoolean object notify() and wait() methods or should I create a lock Object?

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• Best practices for including open source code from other public projects?

  - by Bryan Kemp

  If I use an existing open source project that is hosted for example on github within one of my projects, should I check in the code from the other project into my public repo or not? I have mixed feelings about this, #1 I want to give proper credit and attribution to the original developer, and if appropriate I will contribute back any changes I need to make. However given that I have developed / tested against a specific revision of the other projects code, that is the version that I want to distribute to users of my project. Here is the specific use case to illustrate my point. I am looking for a more generalized answer than this specific case. I am developing simple framework using rabbitmq and python for outbound messages that will allow for sending sms, twitter, email, and is extensible to support additional messaging buses as well. There is a project on github that will make the creation and sending of SMS messages developed by another person. When I create my own repo how do I account for the code that I am including from the other project?

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• Accented characters representation in the URL

  - by Dan

  We have support for various languages in our website, including Spanish, French and Swedish. For now, the links in the site are NOT encoded before sent to the browser, sending the real accented chars (if such exists, i.e. href="www.(dot)example(dot)com/héllo.html") and not their HEX representation. This works & looks good on all browsers, including Chrome, FF and IE. However, we care great deal about SEO. We got this tip that encoding the links before sending them to the browser (so instead of linking to http://www.example.com/héllo, we will link to http://www.example.com/h%E9llo) will improve the way search engines will 'understand' the links and the keywords in the URL. This involves some work at our side, so we wanted to know if there's truth in that tip, but couldn't find anything addressing this issue.

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