SquirrelMail aborting large attachment download?

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Hello all,

we have a SquirrelMail installation with around 5000 active users per
day, ~14000 in three weeks, and switched to 1.4.22 and using imapproxy a
few weeks ago. Everything runs peachy, so SquirrelMail has again proven
to be capable and reliable. Big Thanks to the developers!

Yet, in a few single cases, users have complained that the download of a
large attachment failed due to the object being no longer present,
according to SquirrelMail, and after clicking on the folder name,
SquirrelMail showed the folder as empty. Only after logout and login
again their messages were shown in the folder as before.

This *seems* to correlate with the IMAP server (Dovecot) complaining,
e.g., "Disconnected for inactivity in reading our output
bytes=3588/19231114".

The size of the attachment in two other cases was around 8 MB and around
11 MB, respectively.

The imapproxy doesn't log anything related, apparently.

As mentioned, this is really rare. We have had 3 users (that I know of)
report that, one of them in 3 cases. The logs don't seem to show
anything related except Dovecot as cited above.

The users are not really happy with it, though; seeing their mails as
lost looks like a nasty surprise. I'd really love to fix that or work
around it.

Any ideas?

Regards, Juergen.

-- 
<Juergen.Nickelsen@xxxxxxxxxxxx> Tel. +49.30.838-50740
Zentraleinrichtung fuer Datenverarbeitung, Central Systems (Unix)
Freie Universitaet Berlin, Fabeckstrasse 32, 14195 Berlin, DE

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