Hi all
I have installed mailcow on my server all working great 
but when I setup smtp on a printer it keeps on saying connection failed have try port 25 ,587,465
All work OK on my phone and in outlook
Please can someone help
EnglishSmtp with printer setup
die0u0die The firmware of most HP printers is so outdated that the latest SSL ciphers used by Mailcow don’t work with them…
If you don’t care about security you could try to reenable old and unsecure ciphers again following this article:
Hardening Ciphers - mailcow: dockerized documentation docs.mailcow.email
Instead of using the mentioned ciphers in this article you will have to adapt these settings:
https://ssl-config.mozilla.org/#server=postfix&version=3.9.0&config=old&openssl=1.1.1k&guideline=5.7No guarantees though 
Have something to say?
Join the community by quickly registering to participate in this discussion. We'd like to see you joining our great moo-community!
die0u0die you could also try to read the postfix log files, the error probably tells why it doesnt work.
there are multiple threads regarding HP printers in this forum, pls try the search function.
No one is typing