Comments on Securing your ISPConfig 3 managed mailserver with a valid Let's Encrypt SSL certificate

If you're running your own mailserver, it's best practice to connect to it securely with a SSL/TLS connection. You'll need a valid certificate for these secure connections. In this tutorial, we'll set up a Let's Encrypt certificate for our mailserver that renews automatically.

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By: wayland at: 2025-07-12 09:07:58
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How do I go back to self signed?

My server is at 3.3.0p2 and the 90 day re-issue of certificates breaks all my Thunderbird clients. Each one has to delete and re-enter each of their email accounts. 

At least if it was a self signed certificate we would not have to keep doing this. Letsencrypt for websites seems fine though.