I want to send a mail to a user which email adress ends by @thinc.local, as I can't send this mail the usual way (for instance gmail discusses with Google MX server which doesn't recognize this address), I had to find a mail server which host this email address.
So I connected in SMTP (
telnet IP_add 25) to different servers and I checked with VRFY or EXPN command if the email address was hosted by the server or not.
I had one server which responded "positively":
I know the IP_addr of the mail server AND the domain name (barry.thinc.local). So I tried to send an email to email@example.com by adding this server to the outgoing SMTP server list in Thunderbird (I chose no security or authentication method, maybe this is a problem). But I still get a Delivery Status code message back.
I would like to have your opinion, because I'm feeling that I missed something.
P.S: I'm working in a training environment, so don't need to ask if I'm doing something illegal ;-)