The incoming and outgoing email server names (for IMAPI, POP3 and SMTP) are all the same.
mail.yourdomainname.tld where yourdomainname.tld is replaced with the name of you actual domain.
An example would be if your domain is connectweb.net then your mail server names, for both incoming and outgoing, will be mail.connectweb.net
We use standard ports:
SMTP port = 25
POP3 port = 110
IMAPI port = 143
Our alternate SMTP port is 8383 (this is not the standard)