Email port services.

For default email port service is

POP3: 110
IMAP: 143
SMTP : 25


Secure SMTP (SSMTP) - port 465

Secure IMAP (IMAP4-SSL) - port 585

IMAP4 over SSL (IMAPS) - port 993

Secure POP3 (SSL-POP) - port 99

Check this port when server not response.