Re: telnet on port 25
From: Frye, Matthew (Matthew.Frye_at_REXHEALTH.COM)
Date: 04/19/04
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Date: Mon, 19 Apr 2004 09:02:19 -0400 To: aix-l@Princeton.EDU
> Hi *,
> I am trying to telnet to our mail server(Win NT) from
> an AIX box
> using port 25. When i connect it gives me a message saying
> ready but no
> prompt to execute any commands, and it does not even ask me
> the username and
> a password. I have never connected on port 25 using telnet
> before. Is this
> the way it works or am i doing something wrong. Pl find the
> output i have
> got when executing those commands.
>
>
> telnet> open 195.183.212.12 25
> Trying...
> Connected to 195.183.212.12.
> Escape character is '^]'.
> 220 <hostname> ESMTP Server (Microsoft Exchange Internet Mail Service
> 5.5.2657.72) ready
Generally, telnet'ing to port 25 is used as a diagnostic tool to determine
the status of a mail server. If you receive a ready, then your mail server
is able to receive incoming mail. You would not (and should not) receive a
login prompt at all. Telnet'ing to 25 can also be used to send fake mail to
a server, but usually it has a significantly different look from regular
mail, because more header information* is passed when an actual mail server
connects to that machine.
Matt Frye
Sr. Systems Programmer, RS/6000 Group
Rex Healthcare
(919) 784-3791
*deliberately vague
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- Previous message: Ignacio Vidal: "Re: telnet on port 25"
- Maybe in reply to: Kumar, Praveen (cahoot): "telnet on port 25"
- Next in thread: Holger.VanKoll_at_SWISSCOM.COM: "Re: telnet on port 25"
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