Here's a follow-up on this case too, in case it can help others: On Apple Mail clients with the problem, a now confirmed workaround is to store the drafts locally instead of Imap. Filed a feedback @ Apple, if that's supposed to help...
Thanx for all contributions (Sam's in particular as always, as he pointed to the right background...)! Lorenzo On 09.05.2009, at 00:45, Sam Varshavchik wrote: > Lorenzo Perone writes: > >> However, it is a showstopper that sometimes mails which have just >> been sent are not kept in the Sent folder on the server. I am >> running Courier 0.54 by now, and plan to upgrade to 0.61.1 on >> FreeBSD in the next days. Has anyone experienced this problem too? >> Are there any bugfixes from 0.54 to 0.61 which could _potentially_ >> fix such an issue? > > No. Courier-IMAP does not randomly delete messages. > >> What I can say - from my personal experience with Apple Mail on Mac >> OS X 10.5.x - is that when it happened to me, the message was >> immediately lost. That is, I write it, the mailer autosaves it in >> Drafts during the writing, and then after I click send, the >> message is sent and delivered but does not appear in Sent. Not >> only on the client. If I look on the server, there's no such >> message in my .Sent Maildir. >> What I suspect right now is that there might be a problem with >> moving messages to the Sent folder, so that sometimes server and >> clients get > > If there was a problem, the IMAP server would've returned an error > code. > > It is very well possible that your mail client takes it for granted > that the message will always be succesfully saved to the folder, and > does not check the error code. > >> out of sync. So one question is: does courier actually handle the >> copying of a sent message to the Sent folder, or is it by design >> that this is something the client has to do? > > In your situation, Courier does not copy anything. The message's > contents are held entirely in memory by your mail client. It > connects to port 25 and sends the message using SMTP. Then, it uses > the existing IMAP connection to upload the message into the Sent > folder. > > If an error occured that prevented the message from being saved, the > IMAP server would return an error code accordingly. It is the IMAP > client's responsibility to read the error code and display an error > message accordingly, or take some other fashion. If the IMAP client > completely ignores the error message, there's nothing that the > server can do about it. > >> There's also another strange behavior that might be related to it, >> which I have noticed on several Imap clients: when writing a new >> message, sometimes it gets repeated many times in the Drafts >> Maildir. What could be the reason for this too...? > > The IMAP client either does not delete an older message draft, after > uploading a newer draft, or uploads multiple copies of the message. > The IMAP server does not do anything on its own initiative, it > always responds to commands from the IMAP client. > > A very common programming error is for the IMAP client, through poor > design, opening multiple IMAP connections to the IMAP server, at the > same time. > > That by itself is not really a problem, because IMAP allows it. > Still, in nearly all cases there's no real good reason to do that. > Nearly anything that can be done with multiple IMAP connections can > also be done with just one. > > However, the problem is that most IMAP clients usually make > unwarranted assumptions, such that the changes made to the contents > of the folder by one IMAP connection are immediately visible by the > other IMAP connection. For example, after adding a message to the > folder using one IMAP connection, the IMAP client may expect the > other IMAP connection to be able to read it or do something with it. > > There is no such guarantee in the IMAP specification. IMAP does not > guarantee that changes to a folder's contents made by one IMAP > connection is immediately reflected in the other one. They are two > completely independent logins, and any changes may not get reflected > immediately. > > When you have a badly designed IMAP server that uses multiple IMAP > connections without having any real good reason to do so, it's quite > often that you also end up with an improper IMAP implementation > altogether, that expects certain IMAP server behavior, and takes it > for granted, issues invalid IMAP commands, and ignores the > subsequent error messages, because it also assumes that the commands > will always work. > > > > ------------------------------------------------------------------------------ > The NEW KODAK i700 Series Scanners deliver under ANY circumstances! > Your > production scanning environment may not be a perfect world - but > thanks to > Kodak, there's a perfect scanner to get the job done! 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