Yes, telnet will work by default.
Telnet Command = telnet mail.domain.com port#
example telnet mail.TechHausHost.com 110
example2 telnet mail.perseathsoting.com 25
Commands available while using telnet:
| close |
close current connection |
| display |
display operating parameters |
| open |
connect to a site |
| quit |
exit telnet |