The port numbers you set determine the protocol your email uses.
IMAP (Non SSL)
IMAP (SSL)
POP3 (Non SSL)
POP3 (SSL)
1) POP3 & SMTP settings with SSL
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SSL Type : SSL/TLS
POP3 - Port 995
SMTP - Port 465
2) POP3 & SMTP settings with Non SSL
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SSL Type: None or STARTTLS
POP3 - Port 110
SMTP - Port 587 or 25
3) IMAP & SMTP settings with SSL
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SSL Type : SSL/TLS
IMAP - Port 993
SMTP - Port 465
4) IMAP & SMTP settings with Non SSL
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SSL Type: None or STARTTLS
IMAP - Port 143
SMTP - Port 587 or 25
You can check if a port is opened or not for your server in the following link by entering your server hostname/IP and port number:
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http://ping.eu/port-chk/
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