# Hostname doesn't match server certificate (Let's Encrypt)

**URL:** <https://meta.discourse.org/t/hostname-doesnt-match-server-certificate-lets-encrypt/104568>\
**Category:** Self-hosting\
**Created:** [December 18, 2018, 4:06pm UTC](https://meta.discourse.org/t/hostname-doesnt-match-server-certificate-lets-encrypt/104568 "2018-12-18T16:06:32Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pfaffman](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/pfaffman/32/120154_2.png) [@pfaffman](https://meta.discourse.org/u/pfaffman)\
**Post date:** [December 18, 2018, 6:14pm UTC](https://meta.discourse.org/t/hostname-doesnt-match-server-certificate-lets-encrypt/104568/2 "2018-12-18T18:14:49Z")

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This is an issue with the mail server certificate. You can probably get one with Let’s Encrypt, but it’s not a problem with Discourse, so ask for help from the docker-mailserver people. If you want people to receive your mail and not to spend a long long time getting your mail server trusted, you’ll be better off using a mail service like Mailgun.

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_[View the full topic](https://meta.discourse.org/t/hostname-doesnt-match-server-certificate-lets-encrypt/104568)._