Quick little script for testing whether or not a mail server is setup correctly.

email_test.sh

#!/bin/bash

SMTP_SERVER='mail.example.tld'
EMAIL_FROM="$(whoami)@$(hostname)"
EMAIL_DESTINATION='[email protected]'

cat << EOM | nc -C ${SMTP_SERVER} 25
EHLO $(hostname)
MAIL FROM: ${EMAIL_FROM}
RCPT TO:   ${EMAIL_DESTINATION}
DATA
From: $(grep -P "^$(whoami):" /etc/passwd | cut -f5 -d:) <${EMAIL_FROM}>
To:   <${EMAIL_DESTINATION}>
Date: $(date +"%a, %d %b %Y %H:%M:%S %z (%Z)")
Subject: A Simple Test Message

This is a message for testing whether a mail server is setup correctly or not.
.
QUIT
EOM