> > an smtp server is actually listening at the domain > How would you test that? telnet domain.com 25 And see if you get an SMTP response from a server. It

> > an smtp server is actually listening at the domain > How would you test that? telnet domain.com 25 And see if you get an SMTP response from a server. It would look something like this: 220 domain.com ESMTP Postfix After you connect, if you want to see if your email address is active, you can try this (lines beginning with numbers are the server responses, you type the non-numbered lines): helo yahoo.com 250 domain.com mail from: afakename@yahoo.com 250 2.1.0 Ok rcpt to: yourfakeemailname@thefakeyahooname.com And you'll either get back: 550 5.1.1 <yourfakeemailname@thefakeyahooname.com>: Recipient address rejected: or 250 2.1.5 Ok A 550 response means that your fake email address is not setup to receive email. A 250 means that it is accepting email at the rcpt to: address.