SSMTP is a simple MTA(Message Transfer Agent) to send off mail from a Linux system to a mailhub. For a mailhub will use a Gmail account. SSMTP can send emails by itself or you can install mutt (it’s another simple MTA).
Always it’s a good idea to configure your server to notify you with some cronjobs for errors instead of not doing it at all and just checking logs by yourself :P

Installing sSMTP

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1. Open a terminal and connect with ssh or just type (for local installation)

Configuring sSMTP

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Once you’re done give …

…and change only these fields inside ssmtp.conf

and at the end of the file add these (one per line)

That’s it!

Sending emails from sSMTP

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Type in terminal

and then type (notice lines and the blank line after subject)

then press Ctrl D and sSMTP will send your email before closing.

Send predefined emails from .txt files

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Write your message to a txt file  by keeping the standard format from above and type …

Tips:

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• Overall i suggest to install sSMTP and send your emails with mutt
• schedule some cronjobs
• install and configure fail2ban (if you want to add some basic security to your server)

thnx, Specktator.