dovecot - Mar 2007 - Timed Out or Disconnect Errors on emails with attachments

Hello all,

I've migrated our Maildir system from Courier-IMAP-SSL to Dovecot with 
SSL and now we're getting "Connection to <server> Timed Out"
errors when
sending mail with attachments.  The mail gets sent, however it doesn't 
save the mail in the user's "Sent" folder. 

Our IMAP and SMTP servers are different.  So the client sends to the 
SMTP server first, completes that, and then opens a channel to Dovecot 
and dovecot appears to receive the data (TB gives a progress bar as it's 
sending to dovecot) and then disconnects _after_.

We have a mixed bag of clients here from Thunderbird on Linux and 
Windows, through Outlook Express to Outlook.  All show similar errors.

I enabled the logs on dovecot, however it wasn't very informative.  At 
the time it occurred the only line in the log file was:
dovecot: 2007-03-13 16:21:12 Info: IMAP(tudor): Disconnected

This is obviously different from "Disconnected: Logged out".

Emails without attachments behave ok, it only occurs with emails with 
attachments.

Has anyone else had any experience of this?

Cheers,
Tudor.

On Tue, 2007-03-13 at 16:35 +1100, Tudor Holton wrote:
> I've migrated our Maildir system from Courier-IMAP-SSL to Dovecot with 
> SSL and now we're getting "Connection to <server> Timed
Out" errors when
> sending mail with attachments.  The mail gets sent, however it doesn't 
> save the mail in the user's "Sent" folder. 
What OS is Dovecot running in? What Dovecot version? What configure
options? There have been bugs related to this, but I thought they were
all fixed.
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Tudor Holton wrote:
> Hello all,
> 
> I've migrated our Maildir system from Courier-IMAP-SSL to Dovecot with 
> SSL and now we're getting "Connection to <server> Timed
Out" errors when
> sending mail with attachments.  The mail gets sent, however it doesn't 
> save the mail in the user's "Sent" folder.
> Our IMAP and SMTP servers are different.  So the client sends to the 
> SMTP server first, completes that, and then opens a channel to Dovecot 
> and dovecot appears to receive the data (TB gives a progress bar as
it's
> sending to dovecot) and then disconnects _after_.
> 
> We have a mixed bag of clients here from Thunderbird on Linux and 
> Windows, through Outlook Express to Outlook.  All show similar errors.
> 
> I enabled the logs on dovecot, however it wasn't very informative.  At 
> the time it occurred the only line in the log file was:
> dovecot: 2007-03-13 16:21:12 Info: IMAP(tudor): Disconnected
> 
> This is obviously different from "Disconnected: Logged out".
> 
> Emails without attachments behave ok, it only occurs with emails with 
> attachments.
> 
> Has anyone else had any experience of this?
With dovecot rc15 I frequently get a time out while Thunderbird copies to the
IMAP
sent folder.  It only happens from outside my network.  The client is using SSL.
I
never see the problem for clients on the LAN. One client on the LAN uses SSL and
the
rest (about 20) do not, so the problem may just be network latency or something
not
related to SSL.  I don't see any relationship to attachments, it happens
even without.

Mark Nienberg

dovecot-request at dovecot.org wrote:
>
> On Tue, 2007-03-13 at 16:35 +1100, Tudor Holton wrote:
>   
>> I've migrated our Maildir system from Courier-IMAP-SSL to Dovecot
with
>> SSL and now we're getting "Connection to <server> Timed
Out" errors when
>> sending mail with attachments.  The mail gets sent, however it
doesn't
>> save the mail in the user's "Sent" folder. 
>>     
>
> What OS is Dovecot running in? What Dovecot version? What configure
> options? There have been bugs related to this, but I thought they were
> all fixed.
>   
I apologise, I just realised that I hadn't included that information.

The server is a current Ubuntu Edgy Box.  It has Dovecot 1.0rc2.  I now 
see there have been 25 rc's since then.  (Yikes!)  So I guess I should 
be complaining upstream.

I did search the net for several weeks, however, and found no mention of 
this problem, even in the Dovecot wiki or mailing list archive.  So if 
you say it's fixed, then I'll put something in the wiki to that effect 
and go badger the Ubuntu guys for an upgrade. :-)

Cheers,
Tudor.