email . . . choosing between pop3, imap, smtp
I've just switched to a new server host for our small business (with 5 employees.) In the past we used POP3 to pick up mail from our old server, but I'd prefer a more secure method for the new server (maybe POP3S).
Even though we're behind a firewall, I'd like as few ports open as possible. However, I just found out our server host has opened ports for SMTP, POP3 and IMAP.
Are all three of these services needed just to pick up or send email?
We do use the server to send group mailing to our customers, but all employees individually use local ISPs to send their email . . .
The email clients used are Outlook express, Eudora, and Netscape.