Why does mutt fail to send mail through exchange server?

Solution Unverified - Updated -

Issue

  • Mutt fails to send mail through exchange server. maillog suggests that sendmail is considering two relay IP addresses for example.com "relay=192.x.x.x. [67.x.x.x]":
Feb 17 17:00:22 host sendmail[19905]: s1HM01oT019903: to=<user@example.com>, ctladdr=<user@example.com> (502/500), delay=00:00:21, xdelay=00:00:21, mailer=esmtp, pri=120549, relay=192.x.x.x. [67.x.x.x], dsn=4.0.0, stat=Deferred: Connection timed out with 192.x.x.x.

Environment

  • Red Hat Enterprise Linux 5.6
  • sendmail-8.13.8-8.el5.x86_64

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