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• iOS chat application design, sending/relaying the message over to the end user

  - by AyBayBay

  I have a design question. Let us say you were tasked with building a chat application, specifically for iOS (iOS Chat Application). For simplicity let us say you can only chat with one person at a time (no group chat functionality). How then can you achieve sending a message directly to an end user from phone A to phone B? Obviously there is a web service layer with some API calls. One of the API calls available will be startChat(). After starting a chat, when you send a message, you make another async call, let us call it sendMessage() and pass in a string with your message. Once it goes to the web service layer, the message gets stored in a database. Here is where I am currently stuck. After the message gets sent to the web service layer, how do we then achieve sending/relaying the message over to the end user? Should the web server send out a message to the end user and notify them, or should each client call a receiveMessage() method periodically, and if the server side has some info for them it can then respond with that info? Finally, how can we handle the case in which the user you are trying to send a message to is offline? How can we make sure the end user gets the packet when he moves back to an area with signal?

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• FTP Synchronization software for Mac or PC

  - by evanmcd

  Hi, I've been using FTP Synchronizer for awhile and generally have had pretty good results with it. But, I've just moved to a Mac full-time (at work as well as home now) so want to get a native client if I can. I've tried the only one that I've found - SuperFlexibleSynchronizer - but it crashed every time I loaded up an FTP to FTP synch attempt. The most important features to me are: 1) ability to synch with a large number of files (thousands), as I generally work on sites with large number of files. 2) FTP to FTP synch. This would be very helpful as I work with some CMS based sites for which users upload files while on staging and don't want to move files locally first before moving live. Thanks! Evan

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• Connection string during installation

  - by anon2009

  Hi, I've been convinced to use windows setup files(msi) for the installation of my new windows forms application after I asked a question here and got some excellent answers (thank you all): http://serverfault.com/questions/97039/net-application-deployment Now i have a different question: My application will need to access a SQL Server to provide users with data, which means that the connection string must be stored in the client's app.config file. How should I handle this? During installation, the user enters the connection string to that database? How they get the connection string? In an email from the admin? What if the admin wants to use SQL authentication and need to put the user info at the connection string? So you know, the app will be sold via the internet, so I don't have any access to the admins or the network. Any suggestions? Thanks in advanced.

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• periodically overridding NTP for simulation purposes

  - by Gerard

  I have this situation: NTP is used to sync time on a set of Windows 7 and Server 2008 machines. Nothing out of the ordinary about this. periodically on this system, the time needs to be changed for testing/training purposes (it is a training simulation system that has a lot of time-dependent operations). My question: As NTP in general does not really like big time jumps or changes AFAIK, is there a standard way this could be set up to allow the clock to be changed at the root NTP server in the system and have it propagate through the system in a reasonable amount of time (a minute or two?) It is not acceptable to disable and/or restart all NTP client services to achieve this. Any ideas? It would be nice to do this without writing some kind of custom script to disable services and update clocks all over the place. Thanks in advance.

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• Problems with merge replication

  - by jess

  Hi, We are developing a multi-user desktop application with users located in different countries. The platform is - .net 3.5, SQL Server 2008, WinForms. Now, my client has used the help of a DBA who has implemented merge replication. To facilitate replication, we made all our primary keys as GUID. Now, we are facing these issues with replication - subscribers expiration sometimes stops replication and we have found no clean way to re-add every change to db schema requires to poll the whole data all over again! This seems to be strange, what could be the problem here? Also, sometimes we have duplicate keys, and that too stops replication I am sure these issues can be resolved. Maybe, we have not gone the right way to implement. Can you suggest how to go about implementing. Or, is the above information enough to diagnose the problem?

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• Disable pasting in a textbox using jQuery

  - by Michel Grootjans

  I had fun writing this one My current client asked me to allow users to paste text into textboxes/textareas, but that the pasted text should be cleaned from '<...>' tags. Here's what we came up with: $(":input").bind('paste', function(e) { var el = $(this); setTimeout(function() { var text = $(el).val(); $(el).val(text.replace(/<(.*?)>/gi, '')); }, 100); }) ; This is so simple, I'm amazed. The first part just binds a function to the paste operation applied to any input  declared on the page. $(":input").bind('paste', function(e) {...}); In the first line, I just capture the element. Then wait for 100ms setTimeout(function() {....}, 100); then get the actual value from the textbox, and replace it with a regular expression that basically means replace everything that looks like '<{0}>' with ''. gi at the end are regex arguments in javascript. /<(.*?)>/gi

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• Temp files created in every folder in Windows Server 2003

  - by i.h4d35

  So we have some folders which are shared over the AD Domain (Windows Server 2003). It was just noticed that in 2 of those folders (which contain only Excel and Word files), whenever a file is opened and closed, the temp file which was opened corresponding to that file still remains. Apparently, this's been going on for the past couple of years (which has led to an insane amount of temp files in each folder/subfolder under those shared folders). These shared folders are under the D:drive and not C: drive. There is only one group (containing 2 users) who access the said folders. I cannot understand if this has to do with the settings/permissions for the User/Group/Individual Client machine. For now, I have manually deleted all the temp files from each folder/subfolder. While this is not critical at the moment, I'd still like to clear this up. Also, it takes an additional fraction of a second to open folders that contains more than 10,000 temp files. Thanks in advance.

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• What am I doing wrong in my config for MySql?

  - by Knight Hawk3

  When I load my my.conf with the config at the bottom Mysql fails to start and prints no errors. I am running Arch Linux (Updated) with the latest MySQL (5.5) and the latest nginx (Well latest in the repository, Not sure how to check. Only installed it today) I will give you any info you ask for. Thanks for helping! # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /var/run/mysqld/mysqld.sock # Here follows entries for some specific programs # The MySQL server [mysqld] port = 3306 socket = /var/run/mysqld/mysqld.sock skip-locking key_buffer = 16K max_allowed_packet = 1M table_cache = 4 sort_buffer_size = 64K read_buffer_size = 256K read_rnd_buffer_size = 256K net_buffer_length = 2K thread_stack = 64K # Don’t listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (using the “enable-named-pipe” option) will render mysqld useless! # #skip-networking server-id = 1 # Uncomment the following if you want to log updates #log-bin=mysql-bin # Uncomment the following if you are NOT using BDB tables skip-bdb # Uncomment the following if you are using InnoDB tables #innodb_data_home_dir = /var/lib/mysql/ #innodb_data_file_path = ibdata1:10M:autoextend #innodb_log_group_home_dir = /var/lib/mysql/ #innodb_log_arch_dir = /var/lib/mysql/ # You can set .._buffer_pool_size up to 50 – 80 % # of RAM but beware of setting memory usage too high #innodb_buffer_pool_size = 16M #innodb_additional_mem_pool_size = 2M # Set .._log_file_size to 25 % of buffer pool size #innodb_log_file_size = 5M #innodb_log_buffer_size = 8M #innodb_flush_log_at_trx_commit = 1 #innodb_lock_wait_timeout = 50 skip-innodb [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash # Remove the next comment character if you are not familiar with SQL #safe-updates [isamchk] key_buffer = 1M sort_buffer_size = 1M [myisamchk] key_buffer = 1M sort_buffer_size = 1M [mysqlhotcopy] interactive-timeout So what is my silly error?

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• JavaOne India Early Bird Discount Ends April 2nd

  - by Tori Wieldt

  JavaOne India3-4 May, 2012Hyderabad International Convention Centre Register Now and Save – For A Limited Time!If you register by 2 April, you'll save INR 1080 on this premier Java technology conference. JavaOne will return for the second straight year to India May 3, 4 at the Hyderabad Convention Center. This year's line up will once again bring some of the leading experts in from all over the world as well as local Indian content. Sharat Chander (Director - Java Technology Outreach) said, "JavaOne is the premier Java technology conference in the world, for developers by developers.  Every year we keep increasing community participation in both the content selection and content delivery, and this year we expect even more."The JavaOne India tracks are:Client-Side Technologies and Rich User ExperiencesLearn about developments in Java for the desktop and practices for building rich, immersive, and powerful user experiences across multiple hardware platforms and form factors. Core Java PlatformDiscover the latest innovations in Java virtual machines. Get deep technical explanations in security and networking and enhancements that allow dynamic programming languages to drive Java platform adoption. Java EE Web Profile, Platform Technologies, Web Services, and the Cloud Update your knowledge on topics such as Web application development, persistence, security, and transactions. This track will also address modularity, enterprise caching, Web sockets, and internet identity. Mobile, Java Card, Embedded, and DevicesThis track is devoted to Java technology as the ultimate platform for mobile computing. It also covers embedded and device usages of Java technologies, including Java SE, Java ME, Java Card, and JavaFX. Share this event: #javaoneIndia

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• How do I allow end user 'blocked sender lists' to work even if the server manages spam filtering?

  - by Myrddin Emrys

  Client filtering in Outlook 2010 is disabled when the server is managing spam filtering. Unfortunately I have a few high profile users that prefer to spam-block mailing lists rather than unsubscribe, so even though the email is not really spam they are upset that it is coming into their mailbox. As seen here, I am not the first person to wrestle with this issue, and the suggested fix there (setting New-FseExtendedOption –Name CFAllowBlockedSenders –Value true) also failed to work for me. Can anyone provide another possible fix? Thank you kindly.

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• Where are Credentials stored for Network Drives on WinXP?

  - by Tom Tresansky

  I have a drive mapped to a folder on a remote machine that I connect to using the Cisco VPN client. The password to the Windows account I use on that remote machine has changed. I had stored the username/password locally, using Window's remember my password feature, so I wouldn't have to enter it every time (the enter user/password login dialog used to appear each time I attempted to open the remote folder, and I would have to look up and enter my credentials). The password to that remote Windows account has changed. Now, I am no longer prompted to enter a user name / password, but instead, upon trying to open the remote folder, receive a message: unknown user name or bad password. How do I view and change these stored credentials?

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• Tweaking log4net Settings Programmatically

  - by PSteele

  A few months ago, I had to dynamically add a log4net appender at runtime.  Now I find myself in another log4net situation.  I need to modify the configuration of my appenders at runtime. My client requires all files generated by our applications to be saved to a specific location.  This location is determined at runtime.  Therefore, I want my FileAppenders to log their data to this specific location – but I won't know the location until runtime so I can't add it to the XML configuration file I'm using. No problem.  Bing is my new friend and returned a couple of hits.  I made a few tweaks to their LINQ queries and created a generic extension method for ILoggerRepository (just a hunch that I might want this functionality somewhere else in the future – sorry YAGNI fans): public static void ModifyAppenders<T>(this ILoggerRepository repository, Action<T> modify) where T:log4net.Appender.AppenderSkeleton { var appenders = from appender in log4net.LogManager.GetRepository().GetAppenders() where appender is T select appender as T;   foreach (var appender in appenders) { modify(appender); appender.ActivateOptions(); } } Now I can easily add the proper directory prefix to all of my FileAppenders at runtime: log4net.LogManager.GetRepository().ModifyAppenders<FileAppender>(a => { a.File = Path.Combine(settings.ConfigDirectory, Path.GetFileName(a.File)); }); Thanks beefycode and Wil Peck. Technorati Tags: .NET,log4net,LINQ

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• What is the meaning of these BIND log messages?

  - by javano

  Please clarify for me the meaning of the following BIND messages in syslog, these are from a DNS resolver. Whilst I think I understand them, I don't know what all four mean, so I think it's best if someone will clarify for me: 1. Oct 14 18:36:34 resolver1 named[14958]: lame server resolving 'arrivatn.co.uk' (in 'arrivatn.co.uk'?): 212.103.224.56#53 2. Oct 14 18:36:36 resolver1 named[14958]: unexpected RCODE (SERVFAIL) resolving '148.128.183.212.in-addr.arpa/PTR/IN': 212.183.136.42#53 4. Oct 14 18:38:49 resolver1 named[14958]: unexpected RCODE (REFUSED) resolving 'internal-server.ournetwork.com/AAAA/IN': auth.dns.server.ip#53 3. Oct 14 18:39:05 resolver1 named[14958]: client 89.187.127.110#42034: query (cache) 'image.sinajs.cn/A/IN' denied Thank you.

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• Configuring SMB shares in OS X

  - by Craig Walker

  I'm at my wit's end trying to control SMB file sharing on my Mac. (OS X 10.5 Leopard). I want to do something fairly simple: share a particular (non-home, non-Public) folder over my my SMB/Windows network with two users (accounts are local to my Mac), and share no other folders with anyone. The instructions on the internet are fairly straightforward: add the folders to be shared to the File Sharing panel of the Sharing System Preferences pane: ..and ensure that I'm sharing through SMB: However, when I actually try to connect via a SMB client (Windows XP in this case), the share does not appear. I see my home directory, "Macintosh HD", and my printers, but not the folder I just shared. I ensured that the underlying directory had the proper permissions (since this seems to affect share visibility) and that the "Shared Folder" checkbox was checked: ...but this didn't have any effect. I checked /etc/smb.conf but there was nothing obviously out of place there. I've also restarted smbd and rebooted. What else should I be looking for?

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• How can I get run Ubuntu Desktop on my Galaxy Nexus?

  - by Jack Senechal

  On the Ubuntu for phones site it advertises the desktop view feature: "The phone becomes a full PC and thin client when docked.". And there's the demo by Canonical of something similar running under Ubuntu for Android. I realize they're different systems, but the end effect is in both is to have a full Ubuntu system running on the phone. I've installed Ubuntu Touch Preview on my Galaxy Nexus (toro), and it's working as expected (no cellular signal, but wifi works, etc). But when I plug in a monitor via HDMI it just mirrors the phone's touch display. There's also currently no bluetooth support for attaching keyboard and mouse. Keyboard only kind of works via USB, and mouse not at all. I've also tried running Ubuntu under Android via VNC, but the lack of responsiveness of VNC makes it impractical for daily use. I'd consider that route again if there is some way to make the UI more responsive. So the question is, how can set up my phone to run Ubuntu Desktop in a way that's useable as a laptop replacement? Is there a way to enable Desktop View on Ubuntu Touch? Or can I run Ubuntu for Android as in the previously referenced demo? Plugging into a monitor would be OK, but I'd love to be able to use the desktop interface with mouse and keyboard through the phone's screen as well. Touch input and an onscreen keyboard would be a plus but is definitely not necessary.

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• How to use ssl_verify_client=ON on one virtual server and ssl_verify_client=OFF on another?

  - by Alexander Artemenko

  I want to force ssl client verification for on of my virtual hosts. But get "No required SSL certificate was sent" error, trying to GET something from it. Here are my test configs: # defaults ssl_certificate /etc/certs/server.cer; ssl_certificate_key /etc/certs/privkey-server.pem; ssl_client_certificate /etc/certs/allcas.pem; server { listen 1443 ssl; server_name server1.example.com; root /tmp/root/server1; ssl_verify_client off; } server { listen 1443 ssl; server_name server2.example.com; root /tmp/root/server2; ssl_verify_client on; } First server replies with 200 http code, but second returns "400 Bad Request, No required SSL certificate was sent, nginx/1.0.4". Probably, it is implossible to use ssl_verify_client on the same IP? Should I bind these servers to different IPs, will it solve my problem?

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• Creating a Website Without a Framework [closed]

  - by James Jeffery

  I've been using PHP Frameworks for so long that I've actually forgot the "best practices" for create websites without one. Usually I will use Symfony, or more recently I've been using Laravel. A client wants a very simple website, but with certain parts of it dynamic. Due to the nature of the site using Wordpress, or a Framework, is out of the question. I'm a sucker for priding myself on my code, but I feel like I'm asking such a basic question that it's killing me to ask. But, what are the best practices for creating websites without a Framework? I like to live by the K.I.S.S (Keep It Simple Stupid!) method of thinking. So, my idea was to just create the .php pages that are required, do any page processing or database interaction on that page, then have the HTML below the closing PHP tag. I would have any helpers/functions in a functions.php file. This is what I remember doing way before I was using Frameworks, and to me it seems like a very old school way of doing things. I've not created a site without a Framework for literally 2+ years, so I've lost my way with the basics. Any advice would be greatly appreciated.

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• Should I use the cool, new and awesome stuff [closed]

  - by Ieyasu Sawada

  I'm in the field of Web Development. I follow a lot of awesome people on Twitter(Paul Irish, Alex Sexton, David Walsh, Rebecca Murphey, etc.) By following these people I'm constantly updated of the new and cool stuff in web development(backbone.js, angular.js, require.js, ember.js, jasmine, etc.) Now I'm creating a web application for a client and because of the different tools, libraries, plugins that I'm aware of I don't even know anymore when do I need to use those or do I even need those, or how do I even implement it in a sane way where I won't have to repeat myself(DRY). What's your advice on what I really need to do in order to become better. Do I really need to use these cool new tools or should I just stick with what I know for now and try to make my code better. Should I unfollow these people in order to not pollute my mind with stuff that I can't really use now because I don't have the necessary experience in order to use it. What sort of things should I really be focusing on for someone like me who has only about 2 years of experience in the field of web development.

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• decrypting AES files in an apache module?

  - by Tom H

  I have a client with a security policy compliance requirement to encrypt certain files on disk. The obvious way to do this is with Device-mapper and an AES crypto module However the current system is setup to generate individual files that are encrypted. What are my options for decrypting files on-the-fly in apache? I see that mod_ssl and mod_session_crypto do encryption/decryption or something similar but not exactly what I am after. I could imagine that a PerlSetOutputFilter would work with a suitable Perl script configured, and I also see mod_ext_filter so I could just fork a unix command and decrypt the file, but they both feel like a hack. I am kind of surprised that there is no mod_crypto available...or am I missing something obvious here? Presumably resource-wise the perl filter is the way to go?

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• Hyper-V extensible virtual switch disables network

  - by Sebastian Krysmanski

  I just installed the Hyper-V role on my Windows Server 2012. It comes with something called a "Hyper-V extensible virtual switch". I assigned it to the only network card in my server. By doing so, the network card became useless/disabled/inactive/.. because the virtual switch disabled all features (IPv4, IPv6, Client for Microsoft Networks, ...) on the network adapter. Is this supposed to happen? I admit I've no idea what this "extensible virtual switch" actually does. A short explanation would be nice as well.

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• GPL - what is distribution?

  - by Martin Beckett

  An interesting point came up on another thread about alleged misappropriation of a GPL project. In this case the enterprise software was used by some large companies who essentially took the code, changed the name, removed the GPL notices and used the result. The point was - if the company did this and only used the software internally then there isn't any distribution and that's perfectly legal under GPL. Modifications by their own employees for internal use would also be allowed. So At what point does it become a distribution? Presumably if they brought in outside contractors under 'work for hire' their modifications would also be internal and so not a distribution. If they hired an external software outfit to do modifications and those changes were only used internally by the company - would those changes be distributed? Does the GPL apply to the client or to the external developers? If the company then give the result to another department, another business unit, another company? What if the other company is a wholly owned subsidiary? ps. yes I know the answer is ask a lawyer. But all the discussion I have seen over GPL2/GPL3 distribution has been about webservices - not about internal use.

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• SPUtility.SendMail and the 2048 Character Limit

  - by Damon

  We were in the middle of testing a web part responsible for gathering information from visitors to our Client's website and emailing it to someone responsible for responding to the request.  During testing, however, it was brought to our attention that the message was cutting off at 2048 characters.  Now, 2048 is one of those numbers that is usually indicative of some computational limit, but I was hopeful that Microsoft had thought through the possibility of emailing more than 2048 characters from SharePoint.  Luckily I was right. and wrong. As it turns out, SPUtility.SendMail is not limited to any specific character limit as far as I can tell.  However, each LINE of text that you send via SendMail cannot exceed 2048 characters.  Since we were sending an HTML email it was constructed entirely without line breaks, far exceeding the 2048 character limit and ultimately helping to educate me about this obscure technical limitation whose only benefit thus far is offering me something to rant about on my blog.  The fix is simple, just put in a carriage return and a line break often enough to avoid going past the 2048 character limit.  I'm sure someone can present a great technical reason for the 2048 character limit, but it seems fairly arbitrary since the "\r\n" that got appended to the string are ultimately just characters too.

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• When do domain concepts become application constructs?

  - by Noren

  I recently posted a question regarding recovering a DDD architecture that became an anemic domain model into a multitier architecture and this question is a follow-on of sorts. My question is when do domain concepts become application constructs. My application is a local client C# 4/WPF with the following architecture: Presentation Layer Views ViewModels Business Layer ??? Domain Layer Classes that take the POCOs with primitive types and create domain concepts (e.g. image, layer, etc) Sanity checks values (e.g. image width 0) Interfaces for DTOs Interface for a repository that abstracts the filesystem Data Access Layer Classes that parse the proprietary binary files into POCOs with primitive types by explicit knowledge of the file format Implementation of domain DTOs Implementation of domain repository class Local Filesystem Proprietary binary files When does the MyImageType domain class with Int32 width, height, and Int32[] pixels become a System.Windows.Media.ImageDrawing? If I put it in the domain layer, it seems like implemenation details are being leaked (what if I didn't want to use WPF?). If I put it in the presentation layer, it seems like it's doing too much. If I create a business layer, it seems like it would be doing too little since there are few "rules" given the CRUD nature of the application. I think all of my reading has lead to analysis paralysis, so I thought fresh eyes might lend some perspective.

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• RemoteApp: Logging in as user x disconnects user y

  - by onik

  I'm having a pretty bizarre problem with a Terminal Services server used for RemoteApp. In our network the server works as it should, but at a client's office if two users log in simultaneously, the first one gets disconnected as the other one connects. The users belong to the same group but have individual users. The similar configuration works fine for all other clients. About the server, it's Windows 2008 R2 x64, no AD, SSL encrypted connections. Event viewer shows no useful information. Any hints where to start debugging? Do you need more info about the setup?

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• Thunderbird: moving email from local Junk folder to IMAP folder yields "Message contains invalid header"

  - by Peltier

  Whenever I try to move an email from a local Junk folder to an IMAP folder in Thunderbird, I get the following error message: The current command did not succeed. The mail server responded: Message contains invalid header If Thunderbird's Junk folder is an IMAP folder on the server, then after Thunderbird has moved messages to that folder, I can successfully move messages from Junk back into to some other IMAP folder. However, if the Junk folder is not on the server, then moving a message from the local Junk folder to an IMAP folder yields the aforementioned error. The only interesting thing I've found about this error is "Message contains invalid header" from the MozillaZine Knowledge Base. That article officially is about importing folders from another email client, and does not mention the Junk filter as another possible cause. However the proposed solution is not very helpful since it requires manual editing of the message box files. Any better ideas? EDIT: make sure you read the comments before answering the question.

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