Issue Issue with Postfix over Port 465 - Delay in Email Delivery

[bandf]

Server operating system version

Ubuntu 22.04.3 LTS

Plesk version and microupdate number

Version 18.0.56 #4

I have an issue with Postfix over port 465. Everything works smoothly over 587. When using port 465, it takes a long time for emails to be sent, whereas over port 587, email delivery is almost instant.
Additionally, it’s worth noting that the mail client takes 10-15 seconds to establish a connection before finally connecting to the server.

I’ve already searched through various forums but haven’t found a solution.

Does anyone have an idea what the problem could be?

 

[defcon8]

I have the exact same problem, takes 15 seconds before there comes any answer (welcome message) by postfix on port 465. You ever found the solution to this?