Actually, I usually see this when the "catchall" setting is set to an
address that doesn't exist, or forwards to an address that doesn't exist.
This also happens when, as Eric was alluding to, the "failure" is
actually fake -- the message it's complaining about wasn't your message
to begin with (thus, backscatter).
My solution is a simple one... I stop playing so nicely because I'm
tired of being taken advantage of... that is, I set all of my domains
catchall setting to DELETED. Now, if you send mail to d...@it4soho.com
instead of d...@it4soho.com... you won't know you screwed up... my mail
server will accept the mis-addressed mail and delete it.
The reduction in SPAM when I did that was measurable! Specifically
because people could no longer "mine" my mailserver for email addresses.
They're all accepted, so "miners" quit trying -- everything they try
appears to succeed, so they don't have a clue which ones actually get
delivered.
An alternative (if you're worried about valid mis-directed mail) is to
setup a special catchall account -- but be prepared to get a lot of mail
in there!
I hope this helps
Dan McAllister
On 9/11/2013 12:36 PM, Eric Shubert wrote:
On 09/10/2013 08:14 PM, ChandranManikandan wrote:
Hi All,
Am getting below message from server
Hi. This is the qmail-send program at mail.xxxx.net
<http://mail.xxxx.net>.
I tried to deliver a bounce message to this address, but the bounce
bounced!
and shows unknown email address which is not sent email or communicate
with them earlier. but they tried to send spam and am getting bounce
message of our email address and it's receive this message randomly .
So all our users forward to me instead of they are getting this message.
So how to receive all failure notice message in single email address
only instead of receiving all our domain email account.
if possible to catch all failure notice bounce message to only one email
account.
Please help me anyone.
--
*/Thanks & Best Regards,
Manikandan.C
/*
This is what's called backscatter.
http://en.wikipedia.org/wiki/Backscatter_%28email%29
Setting up SPF should help.
http://wiki.qmailtoaster.com/index.php/Spf
Dan posted a message to this list recently regarding SPF as well.
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