925212 - Return Receipt fails - server responds "invalid message format"

Status: UNCONFIRMED

(Thunderbird :: Untriaged, defect)

Description

[Ernie]

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:24.0) Gecko/20100101 Firefox/24.0 (Beta/Release)
Build ID: 20130910160258

Steps to reproduce:

Receive message with "return receipt" request.
Select to allow return receipt
Server responds "invalid message format"


Actual results:

Upon error message "invalid message format", next popup message was something like "you should never see this message"


Expected results:

return receipt email sent transparently, no errors or popups.
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The issue is not consistent.  A test email between two accounts in the same domain did not result in this error.  This error usually occurs when receiving mail from a specific email address.  Will update when we find the error reoccurs.