Re: [exim] gotcha: chunking and predata

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Autor: Jeremy Harris
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A: exim-users
Assumpte: Re: [exim] gotcha: chunking and predata
On 18/01/17 21:50, Heiko Schlittermann wrote:
> Evgeniy Berdnikov <bd4@???> (Mi 18 Jan 2017 21:56:49 CET):
> …
>>>   - I'll start with: you don't want it at RCPT or earlier
>>>     because that will impact sender-verify callbacks.

>>
>> Exactly. Session with "MAIL FROM: <>" may be a sender verification
>> callback, so in this case we want to send clear 2xx responses to RCPTs
>> as client expects, suppressing 4xx codes from greylisting engine.
>> That's why greylisting is postponed until DATA command received.
>
> Ah. Got it. Thank you.
>
>     Side note: we should have:

>
>         --> MAIL FROM:<>
>         <-- 250 OK
>         --> VRFY foo@???
>         <-- 250 OK foo@??? accepts mail from <>
>         --> QUIT

>
>     This would avoid all that clumsy sender-verification-de-impact
>     hacks.


We don't at present. In effect, both VRFY and EXPN are dead (though
there is support for dealing with received ones).

--
Cheers,
Jeremy