Sendmail - How to test sending email, verbosely using Sendmail

Mail Server :

Sendmail

Purpose :

To verbosely test sending of email using sendmail

Here how :

Prepare a file with name "mail.txt". This will be the email header & contents that we wanna include when test sending this email. The contents of the file should look like below :

To: put_your_email_here@example.com
Subject: Put a subject here
From: to_whoever@example.org

Of cause, here's the place to put the body

The actual command to test sending email :

sendmail -vt < [email file above]

Example of the output :

$ sendmail -vt < ./mail.txt 
put_your_email_here@example.com... Connecting to [127.0.0.1] via relay...
220 example.org ESMTP Sendmail 8.14.4/8.14.4; Sat, 26 Mar 2011 20:47:21 +0800 (MYT)
>>> EHLO example.org
250-example.org Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
>>> MAIL From: SIZE=144
250 2.1.0 ... Sender ok
>>> RCPT To:
>>> DATA
250 2.1.5 ... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 p1QClLLW073679 Message accepted for delivery
put_your_email_here@example.com... Sent (p1QClLLW073679 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 example.org closing connection

Here's another way of test sending of email through sendmail :

printf "Subject: Put a subject here" | sendmail -vf put_your_email_here@example.com to_whoever@example.org

Adios !!!