[Users] How to configure CM for SMTP at a specific port

[sylpheed at 911networks.com]

CM 3.17.8 on Manjaro.

My email provider is messing everything around and I'm getting very 
unhappy. Unfortunately, I can't switch email provider :(

Is there a way of telling CM to use a port 587 without using SSL for 
SMTP?

If I say: hp310.hostpapa.com:587 in the smtp, I get:

* Account '911': Connecting to SMTP server: hp310.hostpapa.com:587:25...
*** hp310.hostpapa.com:587:25: unknown host.
*** Error occurred while sending the message.


Thank you