Here's a complete interactive session between a telnet application (the
sending server being impersonated by the telnet program and a human) and
the receiving server. At the end, based on the response of the receiving
server, you could have a conditional branch to abort with a "thumbs up"
or "thumbs down" depending on the response.
By the way, you can duplicate this test from any computer workstation,
using telnet, although depending on the telnet OS and the receiving
server's email application, the dialog will vary some.
In the example, "telnet: >" is what the sender types, and "server:" is
the response from the receiver. (The "client:" is the sender's prompt,
after the connection has been established.)
telnet:> telnet mx1.example.com 25
telnet:Trying 192.0.2.2...
telnet:Connected to mx1.example.com.
telnet:Escape character is '^]'.
server:220 mx1.example.com ESMTP server ready Tue, 20 Jan 2004 22:33:36 +0200
client:HELO client.example.com
server:250 mx1.example.com
client:MAIL from: <[email protected]>
server:250 Sender <[email protected]> Ok
client:RCPT to: <[email protected]>
server:250 Recipient <[email protected]> Ok
You'll also need to know what port the receiving server uses...many
email servers no longer support the old smtp standard port 25, instead
using 587, or if they are forcing secure connections via SSL, 465 is common.
Mike
-------- Original Message --------
Subject: Re: [NF] Standard Email Sender Verification Procedures
From: Ken Dibble <[email protected]>
To: [email protected]
Date: 4/29/2013 2:05 PM
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