Resolved Unable to connect to SMTP after IP change

[stevland]

Server operating system version

CentOS 7

Plesk version and microupdate number

Plesk Obsidian Version 18.0.45

Obsidian / Postfix / Dovecot, all fully up-to-date


My web server has been using one shared IP for various websites.

I now want the email server to use it's own dedicated IP.

I've set up a new IPv4 to use as hostname.com / mail.hostname.com.

But...

Connecting to xxx.xxx.xxx.xxx 7/14/2022 2:23:13 PM Connection attempt #1 - Unable to connect after 15 seconds.

I have tried plesk repair mail to no avail.

 

[stevland]

Nevermind.

I assumed I should be able to connect using the IP address, so when it didn't connect I panicked. There's nothing worse than a torrent of customers freaking out with email issues.

But when I use mail.hostname.com it resolves to the new IP and everything works perfectly.