Have you verified that your secondary can actually resolve their outbound
IP properly? I only say this because your situation reminds me of a very
similar incident many years ago where a legacy firewall rule was assuming
that query ports *had* to be 53.
Just a wild hunch, I still remember the time I spent tracking that one down
so just passing it on!
Ken O'Driscoll / We Monitor Email
+353 1 254 9400 | w: www.wemonitoremail.com
On Thu, 2016-10-13 at 15:05 -0500, Ken Johnson wrote:
> Contact at Edward Jones or Alliance Data? A user reports email not
> received, but nothing in my exim logs to show a delivery attempt.
> Edward Jones Technical Assistance confirms the from email addresses
> not in the exim logs) and provided the IP addresses of the sending
> -- not in the fail2ban log, not in the permanent IP block list. EJ TA
> 'host not reachable' for 3.5 hours. On two separate days. The
> authoritative nameservers for the reverse lookup for the sending servers
> in bigfootinteractive.com. (Bigfoot Interactative email services
> by Alliance Data in 2005).
> The primary server (10) in the MX record for the destination would have
> down, but the secondary server (20) was up. If only the first one was
> tried, that would explain it. EJ TA did not have information on this
> mailop mailing list
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