>From: Phil Chambers <P.A.Chambers@???>
>To: Andreas J Mueller <andy@???>
>Cc: exim-users@???
>Subject: Re: [Exim] Invalid Sender: headers
>Date: Fri, 2 May 2003 13:41:02 +0100 (GMT Daylight Time)
...
>> Set smtp_return_error_details in your configuration file, that
>> should at least give some meaningful error message back to the
>> sender. You may also want to set sender_unqualified_hosts to
>> make Exim accept the unqualified addresses from a few broken, but
>> otherwise accepted, hosts.
>
>But the ChangeLog says that smtp_return_error_details says that is
>for address verification callouts. This failure is not the result
>of a callout, but a syntax check.
The Changelog is a bit succinct. From the NewStuff file:
2. There is a new option called smtp_return_error_details, which defaults
false. In the default state, Exim uses bland messages such as
"Administrative prohibition" when it rejects SMTP commands for policy
reasons. Many sysadmins like this because it gives away little information
to spammers. However, some other syadmins who are applying strict checking
policies want to give out much fuller information about failures. Setting
smtp_return_error_details true causes Exim to be more forthcoming. For
example, instead of "Administrative prohibition", you might get:
550-Rejected after DATA: '>' missing at end of address:
550 failing address in "From" header is: <user@???
