[MlMt] Collecting Spy Sheets: CSS allows user tracking in emails

[Benny Kjær Nielsen]

On 5 Mar 2025, at 1:11, Michael Nietzold wrote:

> Is MailMate safe for Collecting Spy Sheets?

MailMate should block everything, but I'm naturally interested if that 
should fail in any way. If you allow fetching external resources (in 
general or for a specific email) then MailMate does not protect you in 
any way.

You might be interested in the following service which you can use to 
test both MailMate and other email clients: 
https://www.emailprivacytester.com

---

I just tried it and the test-email triggered 0 “vulnerabilities” in 
MailMate and it triggered 12 in Apple Mail.

---

In general, I don't guarantee anything since people come up with some 
really smart tricks -- and some times I introduce new bugs. Quite a lot 
of MailMate users seem to also be using Little Snitch and someone will 
usually write to me when the latter happens :)

-- 
Benny
https://freron.com/support
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