> Port 587 is the submission port, it's where users submit emails to the server.
> Server to server communication takes part on port 25, usually which isn't
> open, in your case.

> $ telnet 67.131.57.133 25
> Trying 67.131.57.133...

587 is the alternate for 25 for people whose ISP blocks 25.
That is how it works with no-ip, and how it was working with synchro.net.

http://wiki.synchro.net/howto:vert_mx?s[]=587


 * SLMR 2.1a * Must Go - Some Jehovahs witnesses need shouting at.

---
 þ Synchronet þ CAPCITY2 * capcity2.synchro.net * Telnet/SSH:2022/Rlogin/HTTP