Question SMTP only port 25 without encryption working

[tpk]

Hi,

first time I configured a Domain and an E-Mail in my new Plesk Server, not much experience with Plesk and administring Servers here.

Through my E-Mail client I can only login to Plesks SMTP through Port 25 without encryption, any other Port / encryption does not work. What do I have to do to be able to use encryption (I am using the Gmail webclient as E-Mail client).