I read in a publication that most major email providers include your ip address when sending out emails. The exception being gmail. I'm told this can give you alot of spam. Here at work, we use our webhost for sending out emails, and I wanted to find out if the email server we are sending mail from includes the ip address with the email.
Is it a simple matter of connecting with telnet? Our email uses some sort of encryption as well, so I'm not so sure I would be able to login to it with telnet, and I've never heard of anyone logging into an email server using ssh (for purposes of using the smtp protocol, not bash).