Question Email client(thunderbird , outlook) not connecting to server (postfix)

[alexk345]

Server operating system version

linux

Plesk version and microupdate number

obsidian

Email client(thunderbird , outlook) not connecting to server (postfix)

But webmail.domain.com i was able to login and send and recieve emails.

Host is not solving it. I am stuck

Google is not helping on this.

I have immunify360 on.