On my last blog post I talked about Message notify module, and mentioned we were using it to send digest emails. While Message notify really eases the pain of creating personalized emails, and sending them, we still needed to find a scalable solutions for sending lots of emails. LOTS of emails!

Doing it on hook_cron() is nice if you need to send few emails, but when you need to send thousands of emails a day, it won’t do. Cron will take too long, or might hang up if we try to process too many digest emails at once.

A nice and simple solution we came up with, was to write a Drush command that will process a small batch of users, and use Jenkins to fire up this command every two minutes.

This post will demonstrate the code, that can be used by others - however you will need to copy and change the command to fit your business logic.

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