List of Email Servers: SMTP, POP3, IMAP

Finding how to configure Gmail client programs is easy... by googling it...
For other online email services it is much harder to find options required...

A List of SMTP and POP3 Servers:

A List of IMAP servers

Default Ports:

• SMTP AUTH: Port 25 or 587 (some ISPs are blocking port 25)
• SMTP StartTLS Port 587
• SMTP SSL Port 465
  
• POP Port 110
• POP SSL Port 995
  
• IMAP Port 143
• IMAP SSL Port 993
• IMAP StartTLS Port 143

Gmail POP3, SMTP, IMAP

Hotmail POP3 & SMTP