Telnet to mail server

[skeating]

I have several domains on my Ability mail server. I can telnet to one of the domains, but when I try to telnet to another, I get an error about not accessing it. Is there a setting I need to check to make sure I can telnet to all the domains?

[Code Crafters]

All domains should be setup similar to the following:

A record for domain.com = your web site Internet IP
A record for www.domain.com = your web site Internet IP
A record for mail.domain.com = your mail server Internet IP
MX record for domain.com = mail.domain.com
TXT (SPF) record for domain.com = similar to "v=spf1 mx ~all" (only MX record IPs can send email for that domain)

Then as long as your firewalls and port forwarding is set up correctly, all your domains' MX records (mail.domain.com) should connect via "telnet mail.domain.com 25" and also for other used ports.