Not possible when using SMTP as the mail protocol. Your e-mail client
will compose an aggregate list of recipients from the To, Cc, and Bcc
fields in its UI. That aggregate list is used by the e-mail client to
issue a RCPT-TO command to the mail server. For N total recipients, N
RCPT-TO commands are sent. The e-mail client then follows with 1 DATA
command that contains your message. So for N recipients, N RCPT-TO
commands are sent followed by 1 DATA command. The same e-mail gets sent
to every recipient.
If you want to send a different e-mail to some recipients then you have
to send separate e-mails.
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