Re: [exim] Wrong enhanced status code

On 29/10/2020 12:06, Wolfgang Breyha via Exim-users wrote:
> On 29/10/2020 12:45, Jeremy Harris via Exim-users wrote:
>> On 29/10/2020 11:21, Niels Kobschätzki via Exim-users wrote:
>>> I got a message from a user that our exim apparently sends a wrong
>>> status
>>> code on full mailboxes.
>>>
>>> Something like this:
>>>
>>> 550 Mailbox is full
>>> 550 5.1.1 user@???… User unknown
>>
>> That's two separate responses.  The client much have sent
>> a subsequent SMTP command.  Without knowing what that was
>> it's hard to comment.
>
> Some MTAs interpret the "missing" enhanced status code from exim and set a
> default (eg. sendmail, exchange IIRC). So every 550 without x.y.z gets a
> "user unknown" or something odd then.

That would be... out of spec.

It's perfectly reasonable for a server (eg. Exim) to support ESMTP
and not support ENHANCEDSTATUSCODES (RFC 2034). A client talking
to such a server should not be inventing such codes out of thin air.
--
Cheers,
Jeremy