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I would like to disable/prevent SendMail from sending a notification if delivery of an email has been delayed. By default, sendmail sends this out after 4 hours.

What's the best way to do this? Can I set confTO_QUEUEWARN to 0?

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I would like to disable/prevent SendMail from sending a notification if delivery of an email has been delayed.

You must to know:

  1. Disabling DSN is not recommended settings
  2. STFW can help always
  3. If you can't read and understand sendmail.mc, you aren't postmaster

What's the best way to do this?

RTFM. Namely - confPRIVACY_FLAGS and noreceipts flag

noreceipts causes sendmail to ignore the NOTIFY=SUCCESS DSN extension of the RCPT To: command and to ignore Return-Receipt-To: headers. When noreceipts is used, sendmail does not advertise or support DSN... it is not recommended that you use it either...

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