Originally Posted by dragon

They never blocked port 25 when I used them since I used to connect to external mailservers from a VM connection all the time.

Someone on vm could try this

telnet gryphon.fbdn.net 25

Should get the following responce



Any sane mail server admin would block emails that don't originate from accounts on their mail server from being sent.
Accepting emails for just any old other domain to be sent from your SMTP server is just asking for spammers to abuse it.