I was notified by someone today that yesterday he had sent an email to a mailing
list on an email server I maintain, but the email had not been delivered
to recipients. When I checked yesterday's email log, I didn't see any email
from his email address, so I asked him to resend the message. He did so, but
that email message was also not delivered and I didn't see any log entry for
his email address in today's email log, /var/log/maillog. He
has a verzion.net email address and Verizon recently transitioned its email
service to AOL.
I remembered helping him make that transition last month, so I looked for any
aol.com entries in the log file and found the entry below for an attempt by an
AOL email server to deliver a message that was rejected at the time he told me
he had sent the email today.
# grep aol /var/log/maillog Jun 2 10:50:16 moonpoint sendmail[23955]: ruleset=check_relay, arg1=omr-a006e.m x.aol.com, arg2=127.0.0.6, relay=omr-a006e.mx.aol.com [204.29.186.55], reject=55 0 5.7.1 Spam Block:mail from 204.29.186.55 refused - see http://dnsbl.sorbs.net/
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