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How can I suppress the X-Identity-Key header in templates?

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In a shared IMAP environment, the identity designation (e.g., id2) for a given identity can vary from client to client. The X-Identity-Key header that Thunderbird adds to templates is used by clients to designate the identity from which the template-based message is sent. If id2 (in this example) varies from client to client, then sending of the message from the intended identity cannot be guaranteed.

A workaround is to manually delete the X-Identity-Key header from the template, but with many and changing templates, this is impractical. Is there an option to suppress (or ignore) the X-Identity-Key header?

In a shared IMAP environment, the identity designation (e.g., id2) for a given identity can vary from client to client. The X-Identity-Key header that Thunderbird adds to templates is used by clients to designate the identity from which the template-based message is sent. If id2 (in this example) varies from client to client, then sending of the message from the intended identity cannot be guaranteed. A workaround is to manually delete the X-Identity-Key header from the template, but with many and changing templates, this is impractical. Is there an option to suppress (or ignore) the X-Identity-Key header?

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I suggest you take a look at this bug that just got fixed - hoping that should solve your issue of course.

You could try a Daily Thunderbird version (from here) to see if it will.