1779041 - MDN return receipts sent without my permission by Microsoft email servers

Status: RESOLVED INVALID

(Thunderbird :: General, defect)

Description

[[e-mail]]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0

Steps to reproduce:

Version 91.11.0 on Win11 professional with full Admin rights:
Thunderbird is sending out return receipts for incoming emails that I open, without my knowledge or consent. Preferences are set to NEVER SEND A RETURN RECEIPT.
Global Account preferences are also set to NEVER SEND A RETURN RECEIPT.

Actual results:

Thunderbird is sending out read receipts for incoming emails that I open without my knowledge or consent.

Expected results:

Thunderbird should NOT have sent a return receipt, period.

The consequence is a massive increase in unwanted junk mail.

Comment 1

[[e-mail]]

Severity S2. Couldn't figure out how to add that to the bug once submitted.

Comment 2

[Magnus Melin [:mkmelin]]

Are you using Microsoft email servers?

Comment 3

[[e-mail]]

(In reply to Magnus Melin [:mkmelin] from comment #2)

Are you using Microsoft email servers?

Yes!

Comment 4

[Magnus Melin [:mkmelin]]

"It's a feature." (not kidding!)
These are server side generated when you access the mails on their servers. Nothing we can do about it.