An approach for reducing mail loss with greylisting

Ronald Oussoren wrote:
> All MTAs should be able to deal with this, you can
already get 4xx 
> status codes due to full mailboxes and other transient
failures.

Sorry, no.

All (legitimate) MTAs should be able to deal with transient
failure, period.

The fact is that they don't.

Moving your transient failure indication after the end of
DATA certainly 
isn't a panacea for broken MTAs.

Not only that but I don't even think that moving there would
give any 
overall benefit versus tempfailing before DATA.

Indeed I have heard tell that some (broken) MTAs ignore
errors after the 
end of DATA.

Bill
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