Sending email w/telnet on SMTP server
Log into the smtp server on port 25 with telnet.
You may type "HELP" for more information once connected.
helo rcptisp.com
mail from: you@isp.com
rcpt to: target@isp.com
data
subject: This is the subject line
This is the body of the email.
You may type as much as you like but don't
forget to type a "." on a line by itself
when you are finished
.
Verifying a Receipient exists for email
Note: This feature does not work on all sendmail applications. Most Linux
and Solaris versions of Unix do support this command. This command can
also be used to expand the true mailbox of an alias. If it does not work
on your mail server, try another machine's port 25 sendmail.
Log into the SMTP server (of receipient) on port 25 with telnet.
expn [userid]
[userid@isp.com] = valid
or
userid... User unknown = invalid
Possible Headers w/SMTP
All headers beginning with "X-" are non-standard. This means that you can
add any header you want but it must begin with "X-". Take for instance the
header "X-This-is-a-secret": If you made an email application that looks
for this header, it would recognize the header but no other email client
would, it will simply ignore it. You should conclude that all the headers
that do not begin with "X-" are standard headers and may be required.
All headers are inserted after the "data" command.
<![CDATA[
Return-Path: <sender@isp.com>
Delivered-To: rcpt@isp.net
Received: from mail.integrityol.com ([206.191.137.7]) by mtapop3.gte.net
(InterMail v4.01.01.00 201-229-111) with ESMTP
id <19991214020948.KXK2758560.mtapop3@mail.integrityol.com>
for <tomjo@gte.net>; Mon, 13 Dec 1999 20:09:48 -0600
Received: from oemcomputer [206.191.137.138] by mail.integrityol.com
(SMTPD32-5.05) id A60835201AE; Mon, 13 Dec 1999 18:06:00 -0800
Message-Id: <3.0.3.32.19991213175639.00689528@mail.integrityol.com>
X-Sender: user@mail.isp.com
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.3 (32)
X-Mailer: Microsoft Outlook Express 4.72.3110.1
X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3110.3
From: "John H. Doe" <johndoe@msn.com>
To: <rcpt@isp.com>
Subject: This is an SMTP Test.
Date: Mon, 13 Dec 1999 17:56:39 -0600
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0007_01C09C98.A3A5FBA0"
------=_NextPart_000_0007_01C09C98.A3A5FBA0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Hello, this is an email test via telnet.
No email client necessary.
------=_NextPart_000_0007_01C09C98.A3A5FBA0
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE>EMAIL</TITLE>
</HEAD>
<BODY>
Hello, this is an email test via telnet.
No email client necessary.
</BODY>
</HTML>
------=_NextPart_000_0007_01C09C98.A3A5FBA0--
]]>
SMTP Help
Topics:
HELO EHLO MAIL RCPT DATA
RSET NOOP QUIT HELP VRFY
EXPN VERB ETRN DSN
For more info use "HELP ".
HELO
Introduce yourself.
RSET
Resets the system.
EXPN
Expand an address. If the address indicates a mailing
list, return the contents of that list.
EHLO
Introduce yourself, and request extended SMTP mode.
Possible replies include:
SEND Send as mail [RFC821]
SOML Send as mail or terminal [RFC821]
SAML Send as mail and terminal [RFC821]
EXPN Expand the mailing list [RFC821]
HELP Supply helpful information [RFC821]
TURN Turn the operation around [RFC821]
8BITMIME Use 8-bit data [RFC1652]
SIZE Message size declaration [RFC1870]
VERB Verbose [Allman]
ONEX One message transaction only [Allman]
CHUNKING Chunking [RFC1830]
BINARYMIME Binary MIME [RFC1830]
PIPELINING Command Pipelining [RFC1854]
DSN Delivery Status Notification [RFC1891]
ETRN Remote Message Queue Starting [RFC1985]
XUSR Initial (user) submission [Allman]214-EHLO
NOOP
Do nothing.
VERB
Go into verbose mode. This sends 0xy responses that are
not RFC821 standard (but should be) They are recognized
by humans and other sendmail implementations.
MAIL FROM: [ ]
Specifies the sender. Parameters are ESMTP extensions.
See "HELP DSN" for details.
QUIT
Exit sendmail (SMTP).
ETRN [ | @ | # ]
Run the queue for the specified , or
all hosts within a given , or a specially-named
(implementation-specific).
RCPT TO: [ ]
Specifies the recipient. Can be used any number of times.
Parameters are ESMTP extensions. See "HELP DSN" for details.
HELP [ ]
The HELP command gives help info.
DSN
MAIL FROM: [ RET={ FULL | HDRS} ] [ ENVID= ]
RCPT TO: [ NOTIFY={NEVER,SUCCESS,FAILURE,DELAY} ]
[ ORCPT= ]
SMTP Delivery Status Notifications.
Descriptions:
RET Return either the full message or only headers.
ENVID Sender's "envelope identifier" for tracking.
NOTIFY When to send a DSN. Multiple options are OK, comma-
delimited. NEVER must appear by itself.
ORCPT Original recipient.
DATA
Following text is collected as the message.
End with a single dot.
VRFY
Verify an address. If you want to see what it aliases
to, use EXPN instead.