John C Klensin writes:
Personally and wearing no hats, I like the idea of a new
"LIMITS" extension and EHLO keyword. However, I think we could
This reminded me of something that I wanted to mention. In whichever form
the eventual specification of recipient limits takes place: I believe that
the specification should set a minimum recipient limit. In other words: the
minimum number of recipients that can be advertised.
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.
I don't remember if this was discussed, but this should be called out in any
eventual recipient limit specification: the minimum value is 100, as per
2821 and 821.
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