Author: Ian Eiloart Date: To: Dave Evans, exim-users Subject: Re: [exim] Callout cache domain records with use_sender
--On 3 August 2006 17:20:46 +0100 Dave Evans <davide-20060629@???>
wrote:
> Should the per-domain callout cache records be consulted for recipient
> verification when use_sender is true? I suspect that they should not be
> consulted, but in fact they are consulted.
>
> For example: my server has "require verify=sender/callout", and someone
> tries to email me from <someaddress@???>. coscon.co.uk's mail
> servers are RFC-ignorant, and reject the null sender; therefore, all
> sender verification for that domain will fail, and a callout cache record
> is written (as I understand it) stating that verification for
> "coscon.co.uk" fails for all local parts.
>
> My server also has "require verify=recipient/callout,use_sender". When
> someone now tries to send email *to* <someotheraddress@???> (or
> indeed to the same "someaddress"), verification seems to fail, using the
> cached callout record. However if the callout had actually been
> attempted, it probably would not have failed, because the sender address
> was non-null (therefore coscon's servers would accept the MAIL FROM
> command, etc).
>
> My server's behaviour, the 4.62 source code (as far as I understand it),
> and the spec, all seem to agree that this is what happens, but it doesn't
> seem like a Good Thing. Is it a bug?
It's not a bug - it's a fault in coscon's configuration. Rejecting NULL
senders breaks lots of things. Have you complained to their postmaster?
