Author: W B Hacker Date: To: exim users Subject: Re: [exim] suggestion for those implementing ACLs to suppress
backscatter bounces
Magnus Holmgren wrote:
> On Wednesday 02 August 2006 18:45, Jeremy Harris took the opportunity to say:
>
>>Chris Lightfoot wrote:
>>
>>> No valid bounce will have >1
>>>recipient
>>
>>I think there are cases (mailinglists?) where that isn't so.
>
>
> Example: I send a mail somewhere with a group alias, like tech@???, as
> sender. It bounces. The bounce comes back, tech@??? is expanded into
> magnus@??? and chris@???, which are for some reason forwarded
> to magnus@??? and chris@???. Voilà, a mail with
> empty sender and multiple recipients.
>
>
Is that seen as 'multiple recipients' on initial presentation to Exim?
The expansion could (should?) occur later, so 'not necessarily'.
w/r Mailing Lists - to the extent that an MLM is intelligently configured, any
'proper' bounces should come back in a format that the MTA simply hands-off to
the MLM for handling.
Nothing is without some downside, but so long as spammers do what all too many
of them do, limiting bounces to a single recipient still seems to do more good
than harm.
