Mark Constable writes:
I set up one small VPS as an alternate outgoing mail server for those times when our main mailservers gets blacklisted and do not want it to handle incoming mail or act as a 2nd MX. What config settings could I safely tweak to turn off port 25 and still allow outgoing mail to be delivered?25/tcp open smtp 465/tcp open smtps 587/tcp open submission
All you have to do is basically not start the esmtp listeners. Depending on what startup scripts you're using, it should be a matter of setting ESMTPDSTART=NO (in esmtpd and esmtpd-msa) and ESMTPDSSLSTART=NO in (esmtpd- ssl).
But how are you getting mail to your backup outgoing server? Probably by SMTP from your main servers, so you can't really shut down smtp.
What you should do is bind your esmtp listeners to the server's IP on your VPN. Just set the ADDRESS in your config file to your backup server's IP address that's reachable via the VPN, so it's only going to accept mail over SMTP over the VPN, and won't listen on the public IP addresses.
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