Please help: some incoming mail is not being delivered - stuck in /var/lib/amavis/tmp

[Mahringer, Thomas]

Hi

I'm running Kolab 3.0 on Debian testing with basically the default 
configuration. Everything seems to be working fine, but I recently found 
out that some incoming mail is not being delivered.
I found out by installing steam on a new computer - valve normally 
sends a mail with a short ID one needs on the first login on a new 
machine, I didn't get those mails.
After looking around on my server I found out that the mail is put in 
/var/lib/amavis/tmp/amavis-VERY_LONG_ID/email.txt and remains there for 
a while until it gets deleted at some point. It never makes it to my 
inbox.
Checking the logs also didn't help, they seem to tell me that the mail 
got delivered:

Mar 10 14:26:16 mail postfix/qmgr[3241]: 2F5E8280AF3: 
from=<noreply at steampowered.com>, size=4697, nrcpt=1 (queue active)
Mar 10 14:26:16 mail postfix/smtpd[24736]: connect from 
localhost[127.0.0.1]
Mar 10 14:26:16 mail postfix/smtpd[24736]: 6C5842813F7: 
client=localhost[127.0.0.1], orig_queue_id=2F5E8280AF3, 
orig_client=wcmx2.valvesoftware.com[72.165.61.135]
Mar 10 14:26:16 mail postfix/cleanup[24737]: 6C5842813F7: 
message-id=<E1UEgBT-0005qQ-2M at wcmx2.valvesoftware.com>
Mar 10 14:26:16 mail postfix/qmgr[3241]: 6C5842813F7: 
from=<noreply at steampowered.com>, size=5090, nrcpt=1 (queue active)
Mar 10 14:26:16 mail amavis[24669]: (24669-01) Passed CLEAN 
{RelayedInbound}, [72.165.61.135]:51618 [208.64.200.132] 
<noreply at steampowered.com> -> <thomas.mahringer at tmweb.at>, Queue-ID: 
2F5E8280
AF3, Message-ID: <E1UEgBT-0005qQ-2M at wcmx2.valvesoftware.com>, mail_id: 
U48-SCXYysUV, Hits: -, size: 4690, queued_as: 6C5842813F7, 166 ms
Mar 10 14:26:16 mail postfix/smtp[24738]: 6C5842813F7: 
to=<thomas.mahringer at tmweb.at>, relay=127.0.0.1[127.0.0.1]:10026, 
delay=0.11, delays=0.09/0.01/0/0, dsn=2.0.0, status=sent (250 Ok)
Mar 10 14:26:16 mail postfix/qmgr[3241]: 6C5842813F7: removed
Mar 10 14:26:16 mail postfix/smtp[24734]: 2F5E8280AF3: 
to=<thomas.mahringer at tmweb.at>, orig_to=<tmahring at tmweb.at>, 
relay=127.0.0.1[127.0.0.1]:10024, delay=313, delays=312/0.01/0/0.17, 
dsn=2.0.0
, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 
Ok: queued as 6C5842813F7)
Mar 10 14:26:16 mail postfix/qmgr[3241]: 2F5E8280AF3: removed

I don't know what part of the mail causes this problem. The only way 
for me to reproduce this behavior so far is to make steam send me more 
of these mails. I'm pretty sure though that they are not the only ones 
effected, as I have found other mails in that folder occasionally.

Please help me fix this. I don't know where to go from here, is there 
something else I can check to help solve this problem ?

regards
Thomas Mahringer