Am 05.10.2014 um 14:40 schrieb Henrik Larsson:
On 05-10-2014 13:27, Wietse Venema wrote:
Can you show quantitative evidence that this would actually make a
measurable difference in the volume of unwanted email, or is this
just about warm fuzzy feelings? There are better ways to achieve
the latter than tweaking an email delivery system. Throw another
log on the fire.
I'm sure not able to give you any evidence that this would lower the
amount of spam. But giving a spammer, or a malicious user a clue about
why the mail was blocked, could make him try to find ways around it.
spammers *really* don't read any reject codes
i have some examples here where i respond in fact with
"Unacceptable HELO (Braindead Idiot)" to a HELO where
the client anncounes himself as a 100% clear spammer
i won't post the HELO because i am happy about the announcement
well, each day 30 attempts again and again
Even if it is just about my warm fuzzy feelings, it's just about giving
the administrator a choice if you want to reveal this information or
not. If I had the choice I would remove this information from the
output. Just like I have configured "show_user_unknown_table_name" not
to reveal information about my mailbox tables.
and the admin on the other side of a innocent sender has
no way to find out what happens if he has the luck a user
forwarding him bounces and deserves a answer
