CanIt on Port 587

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This can be done with configuration settings in the /etc/mail/sendmail.mc file. You need to add the line:

  DAEMON_OPTIONS(`Port=587,Name=MSA, Family=inet')dnl

To the file right after the first DAEMON_OPTIONS line. Then to have it take effect run:

  make -C /etc/mail && service sendmail reload

If you have IPv6, the family should be inet6 instead of inet.