Added a section documenting the script
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#!/usr/bin/bash
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#!/usr/bin/bash
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#############################################################################################################
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# check-postfix.sh #
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#############################################################################################################
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# #
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# This script is just something I cooked up for work. I setup a server with posftix configured as an` #
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# email/smtp relay so that some of our old equipment can still function without having to try and #
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# configure our commercial Email Server to accept unauthed requests to send email. #
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# #
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# This requres a few packages to be installed: #
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# - postfix (of course) #
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# - telnet #
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# - sendmail #
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# #
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# The issue is if the postfix service dies and fails to come back up after a restart via this script, #
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# you will be unable to send any emails via a smtp client (as they will try to contact the service #
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# on the server itself). So the only workaround I was able to find is to manually send the email via #
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# telnet using a coproc. You could use a smtp library with python or perl, but I like to keep these #
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# scripts using a single language wherever possible. #
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# #
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# Since telnet is just a basic tcp client we are able to interact with the smpt port on a mailserver #
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# (port 25). So setting it up as coproc allows us to run a concurrent process and pipe commands into #
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# the file-descriptor to send the commands to the mailserver. Which allows us to manually send an email #
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# to an authoritative email server (provided they don't have your IP blocklisted or are filtering #
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# traffic on port 25). #
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# #
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#############################################################################################################
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# BEGIN: Variables
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# BEGIN: Variables
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## Duration to wait to see if service has come back up
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## Duration to wait to see if service has come back up
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DURATION=10
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DURATION=10
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