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A comment on JMAP: Like IMAP but Not Really. Parent comment

Re:JMAP: Like IMAP but Not Really by distances on Friday January 25, 2019 @09:26AM (#18998086)
Not good enough, as many email clients show both of these fields. The whole idea why people use this is to send and receive with one address only, even if you've authenticated with another.
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Re:JMAP: Like IMAP but Not Really by u801e on Friday January 25, 2019 @04:37PM (#19002747)
I believe most email clients will default to using the Reply-To: header to determine the value of the To: header in the reply, so if both headers are specified and even if the email client displays both of them, then the recipient would have a chance to determine whether the email is authentic or not.
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