Re: [exim] detection of "<>" in case of spam.

On Mon, May 13, 2013 at 11:37 AM, Evgeniy Berdnikov <bd4@???> wrote:
>> small question, how can i detect the usage of "<>" as sender of an
>> email in the smtp commands ?
> This is an empty address, use it in ACLs as "recipients=:..."
> or match as regex ^$, or check by some other way.

Remember that the envelope sender is only available like this in the
ACL's during the mail ACL. So you don't yet know anything about the
content of the message at that point.

>> this spam wasn't a bounce mail, just normal spam. Any way of
>> deciding on acl levels if it's a true bounce or just a spam ?
> Pointless. Considerable amount of junk traffic consists of real
> and valid bounces, generated to spam mails with forged addresses.
> If you have several old domains with old addresses, some of them
> might be used by spammers, and you would get bounces to these
> addresses when other sites bounce spam mails.

Exactly.

...Todd
--
The total budget at all receivers for solving senders' problems is $0.
If you want them to accept your mail and manage it the way you want,
send it the way the spec says to. --John Levine