On 3/17/21 9:37 PM, Sam Varshavchik wrote:
I believe that the generally good track record of historical
interoperability of SMTP implementations goes back to what's in
section 4.5.3 of RFC 821, that gives the minimal limits of various
things, like line lengths. And, incidentally, the minimum number of
recipients that an SMTP server should accept is 100 recipients.
It's been a long time but I'm pretty sure I've seen situations in which
it made sense for the recipient limit to be 1. For example: a
special-purpose device (e.g. email to fax, email to printer) or a
gateway to a dissimilar mail system, or anything for which it makes
sense to insist that per-recipient errors get immediately reported to
the client.
Keith
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