You can telnet to port 25 to communicate directly
with the mail server
As long as the protocol is simple, telnet could be useful
telnet orca.st.usm.edu 7777
Trying 131.95.115.204...
Connected to orca.st.usm.edu.
Escape character is '^]'.
MarlDOoM is moving to brauer.math.utoronto.ca (128.100.68.51) port 7777.
Please update your configuration files.
John Chew (poslfit)
jjchew@math.utoronto.ca
Connection closed by foreign host.