Mail being dropped undelivered after postfix

[Eric B Munson]

I can't tell how long this has been happening, but I am not receiving 
email from some senders.  I have only noticed it with 
noreply at steampowered.com, but it could be happening from others. Below 
is a clip from my syslog when a message comes in, postfix says it was 
delivered, but it never shows in my inbox.

May 15 18:36:24 mail postfix/smtpd[4526]: connect from 
wcmx2.valvesoftware.com[72.165.61.135]
May 15 18:36:25 mail postfix/smtpd[4526]: A071EB42F2F: 
client=wcmx2.valvesoftware.com[72.165.61.135]
May 15 18:36:25 mail postfix/cleanup[4437]: A071EB42F2F: 
message-id=<E1UckJZ-0001Jg-7X at wcmx2.valvesoftware.com>
May 15 18:36:25 mail postfix/qmgr[4162]: A071EB42F2F: 
from=<noreply at steampowered.com>, size=5993, nrcpt=1 (queue active)
May 15 18:36:25 mail postfix/smtpd[4526]: disconnect from 
wcmx2.valvesoftware.com[72.165.61.135]
May 15 18:36:30 mail postfix/smtpd[4536]: connect from localhost[127.0.0.1]
May 15 18:36:30 mail postfix/smtpd[4536]: 530CDB42F34: 
client=localhost[127.0.0.1], orig_queue_id=A071EB42F2F, 
orig_client=wcmx2.valvesoftware.com[72.165.61.135]
May 15 18:36:30 mail postfix/cleanup[4437]: 530CDB42F34: 
message-id=<E1UckJZ-0001Jg-7X at wcmx2.valvesoftware.com>
May 15 18:36:30 mail postfix/qmgr[4162]: 530CDB42F34: 
from=<noreply at steampowered.com>, size=6623, nrcpt=1 (queue active)
May 15 18:36:30 mail postfix/smtp[4445]: 530CDB42F34: 
to=<emunson at mgebm.net>, relay=127.0.0.1[127.0.0.1]:10026, delay=0.07, 
delays=0.06/0/0/0, dsn=2.0.0, status=sent (250 Ok)
May 15 18:36:30 mail postfix/qmgr[4162]: 530CDB42F34: removed
May 15 18:36:30 mail amavis[3600]: (03600-01) Passed CLEAN 
{RelayedInbound}, [72.165.61.135]:57486 [208.64.200.128] 
<noreply at steampowered.com> -> <emunson at mgebm.net>, Queue-ID: 
A071EB42F2F, Message-ID: <E1UckJZ-0001Jg-7X at wcmx2.valvesoftware.com>, 
mail_id: LAcsxMV0rH-A, Hits: -2.3, size: 5980, queued_as: 530CDB42F34, 
4517 ms
May 15 18:36:30 mail postfix/smtp[4439]: A071EB42F2F: 
to=<emunson at mgebm.net>, relay=127.0.0.1[127.0.0.1]:10024, delay=5.4, 
delays=0.89/0/0.01/4.5, 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 530CDB42F34)
May 15 18:36:30 mail postfix/qmgr[4162]: A071EB42F2F: removed

This is a kolab-3 install on Debian wheezy with the kolab packages from 
development.

What could be going wrong and how can I be sure that this install isn't 
eating more of my mail?

Thanks,
Eric