On Oct 2, 2017, at 11:47 AM, Noel Jones <njo...@megan.vbhcs.org> wrote:

Note this may *severely* delay deliveries, depending on the sender's
retry policy.  If a message arrives with 100 recipients, the sender
will need to retry 99 times, which will likely take a very long time.

On 02.10.17 12:09, Viktor Dukhovni wrote:
It violates SMTP standards.  Interoperable SMTP servers are required
to accept up to 100 recipients per envelope (message delivery).

Do not cripple SMTP.  Make sure your anti-abuse measures do not impede
legitimate email.  Avoid techniques that impose behaviour changes on
legitimate email senders.

Agreed. However I know one legitimate reason to do this:
accept spam on abuse@ mailbox (may be spam report), while refuse for others.

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