How to change the listen port of postfix,and how to send mail to a mta which listen port is not 25?

Solution Unverified - Updated -

Issue

  • How to change the listen port of postfix from 25 to other port?
  • How to config postfix to send mail to a mta which listen port is not 25?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

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