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Re: [ietf-smtp] parsing SMTP replies (was: Proposed ESMTP keyword RCPTLIMIT}

2021-03-17 21:40:05
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.


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