On Wed, Dec 04, 2024, Cyril Nicodeme via mailop wrote:

> I was wondering if there was a standardized limit, or a "common
> sense" limit on how many (valid) RCPT command a client can send.

You could check the RFCs, e.g.,

RFC 5321                          SMTP                      October 2008

4.5.3.1.8.  Recipients Buffer

   The minimum total number of recipients that MUST be buffered is 100
   recipients.  Rejection of messages (for excessive recipients) with
   fewer than 100 RCPT commands is a violation of this specification.
[[...]]
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