changing virtual postfix hosts and testing SMTP with telnet

As given in my earlier post, the only change required was to change the line
virtual_alias_domains = whateverdomain.com
in /etc/postfix/main.cf and accordingly make changes in /etc/postfix/virtual running
sudo postfix reload
sudo postmap virtual
afterwards. Actually I ran the postfix reload after the postmap also, just to be sure. For testing, using telnet as given in this technet article, telnet on port 25 to our machine failed from dreamhost. Tried restarting the network, firewall box, etc, but probably dreamhost has blocked port 25 for spam-blocking. Restarting network was
sudo /etc/init.d/networking restart
by the way. Finally tried it from our colinux machine, there it was working fine.

telnet our.mail.server.radiosai.org 25
Trying 111.111.111.111...
Connected to our.mail.server.radiosai.org.
Escape character is '^]'.
220 our.mail.server.radiosai.org ESMTP Postfix
MAIL FROM:whatever@yahoo.co.in
250 2.1.0 Ok
RCPT TO:whoever@whatever.in
250 2.1.5 Ok
DATA
354 End data with .
Subject:2nd test
One more test email.
.
250 2.0.0 Ok: queued as 491ID14E8EC
^]
telnet> quit