When setting up email client software e.g. Outlook, Thunderbird, eM Client etc. you may need to enter port numbers, this may need to be desktop computers as well as mobile phones. Fortunately there are only a small set of default email port numbers, so if one number doesn’t work you can easily change to another.
You will only need to use either POP3 or IMAP port numbers, you would never use both at the same time. IMAP is now more commonly used than POP3 so if in doubt setup your email to use IMAP.
IMAP Port Numbers
You should always use the port numbers which use SSL or TLS.
|143||Default IMAP port number which doesn’t use SSL or TLS|
|993||Use this IMAP port to connect securely using SSL or TLS|
POP3 Port Numbers
Most commonly IMAP is now used instead of POP3. You should always use the port numbers which use SSL or TLS.
|110||Default POP3 port number which doesn’t use SSL or TLS|
|995||Use this POP3 port to connect securely using SSL or TLS|
SMTP Port Numbers
SMTP Ports are always needed since this is how emails are sent. Always opt for the secure ports which use SSL/TLS or STARTTLS.
|25||Default SMTP Port which doesn’t use SSL or TLS. Often blocked by ISP’s|
|26||SMTP Port which doesn’t use SSL or TLS. Used when Port 25 is blocked|
|465||SMTP Port used to send email via SMTP securely over SSL or TLS|
|587||SMTP Port used to send email via SMTP securely over TLS and STARTTLS|