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Hi everyone,

I'm working on a privacy-friendly email setup and ran into a challenge with Thunderbird.

My setup: I have a catch-all email address that forwards all incoming emails sent to *@mydomain.com to my real mailbox, secret@mydomain.com. This way, I can use aliases like alias1@mydomain.com, alias2@mydomain.com, etc., without exposing my actual address.

This part works perfectly.

The problem: When replying to a message sent to alias1@mydomain.com, Thunderbird automatically uses secret@mydomain.com as the sender address. That defeats the purpose — the recipient now sees my secret address, which I wanted to keep hidden.

Thunderbird offers a workaround via identities, but it requires creating a separate identity for every single alias, which becomes unmanageable if you use a lot of them.

My attempted solution: My idea was to have my mail server insert a header like:

X-Alias: alias1@mydomain.com

Then, on sending, the server could rewrite the From: header using that value — thus preserving the alias and protecting my actual address.

However, I discovered that Thunderbird strips custom headers like X-Alias when sending. That breaks the solution.

My questions: 1. Is there any way to configure Thunderbird to preserve specific custom headers like X-Alias during sending? 2. Alternatively, is there a better or recommended approach to achieving what I’m trying to do — replying from the alias address automatically, without exposing the real one, and without creating hundreds of identities?

I’d really appreciate any ideas, insights, or suggestions. Thank you!

Hi =)

When I click "Write" and compose an email, the text I type is very, very small. I have tried all the settings in the font settings, etc. I can choose a larger font, but then the text becomes very large for the recipient as well. It can't be correct that the text should be so small, it is hard to read it, that small is it. This happened after reinstalling the new version of Thunderbird this evening. When the email is sent it is ok size. See enclosed pictures:

1) When writing -> Too small 2) In the inbox -> Ok size 3) Email is opened -> Ok size

I really hope someone can help! =)

Best regards, Margrethe

Thunderbird started archiving messages today for 3 Gmail accounts. The messages are not archived on any of the Gmail accounts.

How do I disable archiving in Thunderbird?

Thanks, Steve

Description:

A bug-shaped icon appeared on my screen after accidentally enabling a debug setting. I can’t find an option to disable it.

Steps to Reproduce:

1. Unknown (enabled by mistake). 2. Icon persists despite restarting.

Browser Version:

- Firefox Nightly 142.0a1 (Build #2016101983) - GV: 142.0a1-20250711091324 - OS: Android

Tried:

- Toggling "Remote Debugging" in Settings → Developer Tools. - Restarting the browser.

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