LMTP Timeout

[Phil Chambers]

I have Exim using LMTP to deliver into Cyrus version 2.2.8 on a single server. 
The setup has been working without problem for several years.

I have discovered several users where Exim gets an LMTP timeout when trying to 
deliver to them. If any of the users try to login an IMAP session it hangs.

If I use cyradm I can

info user.<username>
lam user.<username>
cm user.<username>.folder
sam user.<username>.folder cyrus c

But if I try any of

sam user.<username> cyrus c
dm user.<username>.folder
dm user.<username>

it hangs and I have to delete the IMAP session. I have tried closing cyrus down 
and re-starting it and that does not help.

There is nothing in the IMAPD.log

The Exim logs show the LMTP timeout problems started on 13 October but went 
unnotices for quite some time. I have been working on this for several days and 
have drawn a blank. I have several users who cannot work and I can't even 
delete them to start afresh!

Any suggestions please?

Phil.
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Phil Chambers (postmaster at exeter.ac.uk)
University of Exeter