9

Postfix would not bind to the ipv6 port. Gives an error of:

*** postfix/master[39799]: fatal: bind fe80::1 port 25: Can't assign requested address

14

I changed main.cf to bind to 127.0.0.1 instead of localhost

inet_interfaces = 127.0.0.1

Restarted postfix

$ sudo launchctl stop org.postfix.master
$ sudo launchctl start org.postfix.master

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