How to send a message form telnet?

I know some telnet commands:

MAIL FROM:
RCPT TO:

But I don't know how to actually send a message
Is it possible?

These are not telnet commands, they are SMTP commands. Type ? to get help. It may be disabled. If the server you are connecting to relays for that particular domain, then yes you can send messages this way.

Thanks

to send e-mail from a mail server using a telnet session do the following...

telnet x.x.x.x 25 <----- mail servers listen on port 25
mail from:user@whatever.domain
rcpt to:user@whatever.domain
data
type your message
. <---- end with just a peiod on a line by itself


and yes these are SMTP commands not telnet.


if relaying is enabled then you can use any domain in the from / to fields. if relaying is dissabled you can send mail into the mail servers domain and thats it using any mail from: domain. Why would I tell someone how to do this? to test their own server for open relay.

Thank you, junipper!

It worked.
What I'm trying to do is to
test if a message can be sent successfully
through SMTP server that our Montreal office is using.
They are complaining that
they sent us tens of messages this morning
but we don't get them in our office in Toronto.
We get email from everyone else.

I wonder if their ISP mail server
recognizes it as SPAM and removes it.
Is it possible?

what you need to do is telnet in to your server in toronto from within the montreal office so you are using their IP address try sending an e-mail to your internal account using montreals domain and see if you get an error.

also check on ordb.org to make sure you guys are not black listed and make sure you have ptr records ( reverse dns is getting common) if either side is using spam filtering.