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Not sure if its the correct place to ask...
Lets say i am going to send an email to two recipients

TO: field recipient
bbc: field hidden recipient

When the recipient uses Reply to All to answer my mail, will the hidden recipient receive his answer too?

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up vote 9 down vote accepted

No, he won't.

Just the way bcc works -- recipient won't receive any traces of that there was any other repicients and therefore he won't be able to include him in recipients for the reply.

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Because to do so that recipient would have to be revealed to the main recipients software (and therefore to the main recipients). Your email recieved by recipient should contain no trace that it was BCC'd to another person.

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