# Thunderbird - exim - dovecot cert settings

**URL:** <https://community.letsencrypt.org/t/thunderbird-exim-dovecot-cert-settings/200882>\
**Category:** Help\
**Created:** [June 28, 2023, 3:21am UTC](https://community.letsencrypt.org/t/thunderbird-exim-dovecot-cert-settings/200882 "2023-06-28T03:21:37Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![Nekit](https://avatars.discourse-cdn.com/v4/letter/n/7feea3/32.png) [@Nekit](https://community.letsencrypt.org/u/Nekit)\
**Post date:** [June 29, 2023, 7:10pm UTC](https://community.letsencrypt.org/t/thunderbird-exim-dovecot-cert-settings/200882/22 "2023-06-29T19:10:54Z")

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One of the better options is to own an actual (public) domain name and put all your local stuff behind a subdomain (like [local.example.com](http://local.example.com) or [internal.example.com](http://internal.example.com) or [corp.example.com](http://corp.example.com). A more concrete example: [web1.local.example.com](http://web1.local.example.com)). You can make it so these are only resolvable in your local network.

In such a scenario you would be able to issue a publicly trusted certificate for any subdomain, by using e.g. DNS-01 method.

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<div class="post-metadata">

**Author:** ![rg305](https://sea3.discourse-cdn.com/letsencrypt/user_avatar/community.letsencrypt.org/rg305/32/91314_2.png) [@rg305](https://community.letsencrypt.org/u/rg305)\
**Post date:** [June 29, 2023, 7:12pm UTC](https://community.letsencrypt.org/t/thunderbird-exim-dovecot-cert-settings/200882/23 "2023-06-29T19:12:28Z")

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OR  
Issue a wildcard globally and use actual names only within your private network.

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<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/letsencrypt/original/3X/c/a/ca6c06ea1ea201324bba7048c6841ce60236468d.png) [@system](https://community.letsencrypt.org/u/system)\
**Post date:** [July 29, 2023, 7:13pm UTC](https://community.letsencrypt.org/t/thunderbird-exim-dovecot-cert-settings/200882/24 "2023-07-29T19:13:28Z")

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