Default Email Ports

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Here are the default email ports for:

    POP3 – port 110
    IMAP – port 143
    SMTP – port 25
    HTTP – port 80
    Secure SMTP (SSMTP) – port 465
    Secure IMAP (IMAP4-SSL) – port 585
    IMAP4 over SSL (IMAPS) – port 993
    Secure POP3 (SSL-POP) – port 995

SMTP on PORT 587

Port 587 is for users to send out emails on. Port 25 is for servers to relay messages to one another.

That way ISPs can block outgoing SMTP on their networks but still allow users to send email to any mail server through port 587.