Andreas Metzler wrote:
> On 2004-08-05 Paulo Andre <pandre@???> wrote:
>> I am running exim 4.3 and my server can accept email with the
>> following 'mail from:<>' should I be allowing this [...]
>
> Yes. See rfc2821 or 5.2.9 of RFC1123.
We only allow it for messages with a single recipient. It's important
to accept NULL senders so that you can get bounces. However, it's
generally considered OK to reject NULL senders for messages with more
than recipient, as it's typically spam at that point. Here's the ACL we
use for that...
deny message = Only one recipient accepted for NULL sender
senders = :
condition= ${if >{$rcpt_count}{1} {1}}
Steven
---
Steven Dickenson <sdickenson@???>
Computer Network Manager
The Key School, Annapolis Maryland
