Oct 31, 2017

Manually Test Email Server for Open Relays

telnet mail.i88.ca 25
helo me
mail from: [email protected]
rcpt to: [email protected]

If your relays are closed, you will receive an error that you cannot connect, similar to the following error:

Trying IP address...
Connected to  mail.i88.ca.
Escape character is '^]'.
...
554 : Relay access denied