Error: warning: SASL authentication failure: No worthy mechs found

I recently came across an issue on an Ubuntu 20.04 installation recently when I setup Postfix using a smart relay with authentication. But when mails were sent, the following error was being recorded:

warning: SASL authentication failure: No worthy mechs found

I did some research and found I needed to install the libsas12-modules. I though I would share this incase you find it useful.

sudo apt install libsasl2-modules

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