[issue8739] Update to smtpd.py to RFC 5321

[Giampaolo Rodola']

Giampaolo Rodola' <g.rodola at gmail.com> added the comment:

> It is not, but just seemed like good practice to advertise the limit in 
> EHLO and enforce it.  My patch doesn't do a good job of enforcing it 
> since it enforces it before doing process_message.  The problems with 
> 2518 and 1745035 are still there.

Then I doubt it would be a good idea, also because the following comment added in issue 1745035 should still stand:

> The patch does not work as Giampaolo intends.  If the patch were 
> applied as-is, no emails longer than 998 bytes could be sent.

Personally I think there's no other way to gracefully solve this other than using a tempfile to store the data, but since I'm not a user of the module I'm going to let someone else comment about this.

> RFC 5321 doesn't specify it must accept arguments, but I agree it is 
> a good idea.  I'll work on that and submit a new patch.

If there's no RFC which states that, then I would provide arguments for HELP *only* if that is a common practice amongst smtp servers.

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nosy: +josiah.carlson

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