addressing each recipient by the
and having to maintain their own expensive high speed mail servers that
would limit their spamming activities.
SMTP Relay Checker probe tools--freeware available
from SamSpade.org -- usually trigger an intruder alarm
that will alert the IT system administrator of a hacker probing (which
is illegal). Your IP Address, date and time of probe will all be automatically recorded
and you can be subject to law suits.
It doesn't matter
you are trying to be nice to the mail server administrator by telling them
that their mail server are open relay
after you have "probe" them, it is still illegal to do it but if you
really want to probe--it is best to seek written permission first.
Otherwise it's best not to
probe anyone's mail server without permission.
Mail Transport Protocol are used for sending and
receiving email messages. It is a protocol governing email
transmission and reception.
Email servers uses a variety of protocols to communicate with the
Internet and SMTP,
(Post Office Protocol) are for sending and retrieving
mails from a mail server.
Post Office Protocol Version 3
rfc1939 used for
delivering messages to (client) mail readers (fetch mails from a remote
mail server and store it locally).
How email works
If you are using your own mail server program...
See: Mail Server