On Mon, 9 Apr 2018, j.emerlik wrote:

SMTP lets you know the user agent,  I thought that pop3 also.

SMTP does not, at least, it's not part of the protocol.  The User-Agent
is a header optinally inserted by mail clients within the message.
IMAP ID is an extension of the IMAP protocol


Joseph Tam <jtam.h...@gmail.com>

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