MailTrackerBlocker and GPG Mail Extension do not work together

[apparition47]

Describe the bug
If MailTrackerBlocker extension is activated the extension for GPG Mail does not work in Mail (macOS Sonoma 14.5).

To Reproduce
Steps to reproduce the behavior:
Deactivating MailTrackerBlocker let's GPG Mail work again
Activated MailTrackerBlocker extension causes problems with GPG. I see the encryption button in Mail, but it can't be activated. Encrypted e-mails cannot be decrypted. The extension of GPG Mail does not work.

Environment (please complete the following information):

• OS: macOS Sonoma 14.5
• Other enabled plugins/extensions: GPG Mail and SpamSieve (that does work with GPG Mail)

Additional context
cc: @uelef @berkue

[apparition47]

This is a limitation of Mail where only 1 Message Security Extension can be active at a time.

I'm working on restoring baseline S/MIME encryption/decryption (#15) functionality. But if you need encryption/decryption now (or any PGP support for that matter), then I'd recommend setting your Message Security Extension to GPG Mail. If you do this, MailTrackerBlocker still has fallback Safari-style Content Blockers to block trackers but any tracker reporting/identification feature won't work.

[uelef]

Thanks for your hint – I did not know that I could choose GPG Mail as my Message Security Extension … Doing it I am able to use both extensions.

[Kuno26]

Hello,

I am using Sequoia 15.7.3 and am experiencing the same issues (as described).
Has a solution been found yet?
The Apple Support team I contacted requested that I update to Mac OS 26...
and MailTrackerBlocker states on its website that it is not compatible with Mac OS 26...

Is there a solution?

Best regards

[apparition47]

Hi @Kuno26, macOS Mail only supports 1 active Message Security Extension at a time. I suggest enabling the Content Blocker extension and disabling the main MailTrackerBlocker extension if you need GPG/crypto functions.

Also MailTrackerBlocker is compatible with macOS 26.