On 8.12.2010, at 15.10, Patrick McLean wrote:

>> Dec  8 09:46:52 orford dovecot: imap-login: Disconnected: Connection queue 
>> full (no auth attempts): rip=x.x.x.x, lip=x.x.x.x, TLS
..
>> service imap-login {
>>  process_min_avail = 5
>> }

You reached the default limits of imap-login processes. You probably want to 
switch to high performance mode for them: http://wiki2.dovecot.org/LoginProcess

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