Thunderbird

Since Thunderbird 115.0, necessary low-level interfaces are not available anymore preventing Allow HTML Temp extension to work which might lead you to skip Thunderbird entirely.

You can just copy the user.js into Thunderbird's app data directory, e.g. %AppData%\Mozilla\Thunderbird\profileName or ~/.thunderbird/profileName or go to Settings -> Advanced -> config editor when editing values manually.

Addons

Allow HTML Temp
DKIM Verifier

Manual configuration

Please follow privacy-handbuch.de as it's more detailed or use the following for okayish settings.

Remove Autocrypt and PEP

In config editor set to false or "" for search values pep, autocrypt and extraHeaders.

Recommended main settings

mail.inline_attachments = false
privacy.firstparty.isolate = true
mail.showCondensedAddresses = false
mailnews.headers.showSender = true
mailnews.headers.showUserAgent = true
mail.collect_email_address_outgoing = false
extensions.blocklist.enabled = false
extensions.getAddons.cache.enabled = false
mailnews.start_page.enabled = false
mailnews.start_page.url =
mailnews.start_page.override_url =
network.cookie.cookieBehavior =	1
network.cookie.lifetimePolicy = 2

Recommended setting - Check all folders

mail.server.default.check_all_folders_for_new = true

Recommended settings Sort view

mailnews.default_sort_type = 18
mailnews.default_sort_order = 2 // 1 (ascending) to 2 (descending)
mailnews.default_view_flags = 0 // 0 (unthreaded) to 1 (threaded)

Server specific settings

POTENTIALLY DANGEROUS and might end up in spam!

Right click in config editor -> new String in config editor

mail.domain.tld.default.hello_argument;[127.0.0.1]

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