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Occasionally, in the middle of the night, DNS fails to resolve our smarthost address. And sendmail decides to send the mail as a "rejected" message. Because "root" is aliased to an off-box address, that also tries to use the smart host, and fails. And then I get a savemail panic. Is there any way to persuade sendmail that if it can't resolve the smart host, it can queue the message for later?

I have a horrible feeling I just need to get up at 3am and see wtf is going on with the DNS server :-(

Max Allan
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1 Answers1

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Quick fix (temporary?): Use IP address(es) as the smart host.

define(`SMART_HOST',`[10.0.0.2]:[10.0.0.2]')dnl

Square brackets turn off looking for MX records.

Debug procedure suggested:

  1. Use sendmail -d8.20 -bv root to find out DNS queries asked
  2. Make cron execute your test shell script asking the above question every few minutes overnigt
AnFi
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