Set up a Postfix server on Ubuntu for use with Apple Mail (or any mail client)

tekknolagi asked:

I set up a Postfix server on my Ubuntu VPS and it works for sending email from the mail utility in the command line. I set up SPF records, DKIM, pretty much everything I could read about. However, I’d like to be able to send and receive email without SSHing into my box each time.

When I try to set up my server ( with my mail client, and I use “” as my outgoing mail server, I get “Server not responding.” I feel like this is an access issue of some sort, but I’m not sure.

I’m not running a firewall. What could be going on?

My answer:

You should not be attempting to send mail from your email client on port 25; rather using 587 (the standard submission port). Port 25 is meant for transfer between mail servers, and many home ISPs block it to reduce spam from compromised home computers.

Your Postfix server isn’t listening on port 587:

$ telnet 587
telnet: connect to address Connection refused

This means you probably forgot to set up a submission section in Postfix’s configuration file. It should look something like:

submission inet n       -       n       -       -       smtpd
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
  -o smtpd_client_restrictions=permit_sasl_authenticated,reject

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