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We have 2 SMTP gateway running Solaris 10 to relay mails to external. The 2 SMTP servers smtp-1 and smtp-2 are installed in different data center and load balance by F5 load balancer. 

When we shutdown the DC that installed with smtp-1 for maintenance and configured the load balance to route mails that going out to use smtp-2. We experienced that mails are not able to send out found the following in the log: 

<date> smtp-2 sendmail[13711]: [ID 801593 mail.info] uBHGEiBr013709: to=<recipient@gmail.com>, delay=00:15:55, xdelay=00:15:55, mailer=esm
tp, pri=120318, relay=mailhost.com, dsn=5.3.5, stat=Local configuration error

When the DC is up, the SMTP mails are back to normal.

What could be the problem?

12/19/2016 5:40:46 AM
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[a more descriptive Subject might be helpful...]

> tp, pri=120318, relay=mailhost.com, dsn=5.3.5, stat=Local configuration error
>  :

Is that the real/full stat message?

> What could be the problem?

        o 4.5 How can I solve "MX list for hostname points back to hostname"
          and "config error: mail loops back to myself" messages?
(that's from the FAQ)

Note: please read the netiquette before posting. I will almost never
reply to top-postings which include a full copy of the previous
article(s) at the end because it's annoying, shows that the poster
is too lazy to trim his article, and it's wasting the time of all readers.
12/19/2016 11:40:32 AM