It appears that Daniel K.  <[email protected]> said:
>Moreover, the only size limitation is the one that can be discovered in
>the SMTP transaction from the SMTP SIZE extension (RFC 1870).
>
>Are we trying to suggest that if the Reporting organization, at EHLO
>time, discover that the size of the Report message exceeds the limit, it
>should switch to sending an alternative message notifying the recipient
>that their SIZE declaration does not allow them to receive their report?

Short answer: of course not.

DMARC has been in active use for a decade, so we don't have to speculate about
how it works. We know that hardly anyone publishes size limits for reports, and
I at least have not heard any complaints about oversize reports. This suggests
both that reporters have figured out how to send reports of reasonable sizes,
and that domains can handle the reports they get.

With respect to that particular example, if you send enough mail to get big
reports, and your MTA that receives the reports publishes a SIZE that only
accepts small messages, well, that wasn't very clever, was it? I don't see why
we need to spend any time on an entirely hypothetical problem.

With respect to taking the limit syntax out of the ABNF, I'd be OK leaving the
limit stuff in with a note that it's obsolete and reporters aren't expected to
pay attention to it.

R's,
John

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