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In message <[email protected]>, Jeremy Harris
<[email protected]> writes

>For me, operating as an MTA:  if the envelope sender address has
>a domain for which there is no MX or A record in DNS, then I cannot
>send a bounce.  

correct

>For me, as the administrator of an MTA:  if my MTA
>cannot return a bounce to a sender then I cannot maintain overall
>reliability of email, in the notification of error conditions.

as a community we'd much rather than you refused to accept a message
(5xx) rather than accepting it and generating a bounce later !

but how practical that is will of course depend upon what sort of error
you have in mind

>Therefore I do do wish to take responsibility for such a message.

if it doesn't have a valid domain (or null) in the MAIL FROM then it's
quite acceptable (and quite common) not to take responsibility !

- -- 
richard                                              Richard Clayton

They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety.         Benjamin Franklin

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