On Fri, Dec 18, 2015 at 10:35 AM, Ian Eiloart <i...@sussex.ac.uk> wrote:
> > Well, that should be pretty clear from the 4xx vs 5xx status. If it’s 4xx, > you should queue the message for later delivery, otherwise generate a > bounce. I guess if the recipient wants to indicate that you should reduce > your sending rate, that’s something that needs a new status, but you could > use "4.3.1 Mail system full", or "X.4.5 Mail system congestion" because > the sensible response would be to back off. There’s a registry, and a review might be a good idea. > > https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml#smtp-enhanced-status-codes-2 > >
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