port question

[Tony Alfrey]

Consider Alice, Bob and Tony.

Bob and Alice are computer illiterate, Tony perhaps less so.

Bob sends email to Alice's POP server.  For some reason, Alice's POP 
server does not receive this mail, or more accurately, does not process it.
Bob sends the same email to Tony's POP server, no problem.

Tony says to Bob:  "What port are you using for your SMTP server?"
Bob says "Say what?"

Tony says to Alice: "Does your POP server perhaps block port 25?"
Alice says "Say what?"

How can Tony examine the incoming e-mail to know the port?  Tony does 
not host a server, so Tony cannot receive the raw packet stream, Tony 
can only read the e-mail after it has been received by Tony's POP server 
(more accurately, the POP server for Tony's domain hosting service).

Thanks in advance.


-- 
Tony Alfrey
tonyalfrey at earthlink.net
"I'd Rather Be Sailing"