https://bugs.exim.org/show_bug.cgi?id=2159
--- Comment #7 from Jeremy Harris <jgh146exb@???> ---
Assuming the transport being used is smtp, there's a max_rcpt option.
Unfortunately not expanded, so you'd need a duplicate transport just for
null-sender mails, and the decision made in the routers.
(or you could turn the bug into an RFE to make it expanded)
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