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is correct - I am unaware if any mechanism in the email specification that allows this behaviour. You woukd need to send out multiple emails, or find /write a mail client that does tjis or modify your MTA (mail server to do this). Modifying a Postfix MTA to do this is likely to be the most doable, but will still tequire some non-trivial scripting to create, and will change the way bcc behaves (bcc is designed to silently copy other entities in on an email to keep them in the loop without the person/people in the to and cc fields being aware.)
– davidgo
Commented Mar 21, 2019 at 18:00
well it does not work that way, if people read "undisclosed recipients" then they are aware!
– Millemila
Commented Mar 21, 2019 at 20:06
@Millemila: What do you mean by “it does not work that way”?
– Scott - Слава Україні
Commented Mar 23, 2019 at 2:21

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