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returning a read receipt has weird text in it. Also 2 attachments are sent. MDNPart2.txt and MDNPart3.txt

sabrinahorst
sabrinahorst
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Why is my thunderbird (Imap with gmail) sending this weird read receipt. ?

I get complains from the receiver about it.

Is it possible to configure what message is sent back to the receiver?

Why is my thunderbird (Imap with gmail) sending this weird read receipt. ? I get complains from the receiver about it. Is it possible to configure what message is sent back to the receiver?
Attached screenshots

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sabrinahorst
sabrinahorst Question owner
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I am using Thunderbird version 38.6.0