I thought messages generally failed if they were not delivered to the destination mail server within 24 hours. I guess I was wrong.
I received 2 email messages from the same sender that appear to have been 'mailed' 6 day ago. The only 2 Received headers were:
Received: from 127.0.0.1 (EHLO smtp1.av-mx.com) (18.104.22.168) by mta181.mail.ac4.yahoo.com with SMTP; Tue, 27 Apr 2010 15:30:45 -0700
Received: from Office3 (unknown [ipaddr]) (Authenticated sender: sender email) by smtp1.av-mx.com (Postfix) with ESMTP id A8DAC1044A4 for <my email>; Wed, 21 Apr 2010 13:31:49 -0400 (EDT)
If I'm reading these correctly, the sender did send them last week (which is what he told me) but my email provider did not receive them until today because they sat at av-mx.com (whatever that is) for 6 days. Or did I miss something?