omrob at omsoft.com
Wed Apr 8 11:07:35 PDT 2009
Issue: Email not being delivered from wheel.dcn.davis.ca.us to City of
Reported: Omsoft staff on Monday April 6th.
Action and Analysis: The City of Davis WebSense email firewall is
blacklisting DCN's mail server and the MX mail server. We believe this
is being caused by SPF failures. Since DCN was created they were the
original mail server for ci.davis.ca.us and there are still lots of
forwarded accounts of DCN mailboxes being forwarded to ci.davis.ca.us.
Since DCN doesnt do SPF SRS any mail forwarded this way causes SPF
failures, and an aggregate of SPF failures over a certain time period
causes the blacklist.
Solution: Either DCN be allowed as a trusted forwarder, or all these
email boxes forwarding to ci.davis.ca.us addresses needs to be terminated.
UCD Class of 96
More information about the DCN-Technical-Committee