Chuck,
Thanks for the quick reply!
I'm not sure about the exact mechanism that causes "backscatter" but
that server's IP address has been blacklisted by Barracuda. After seeing
this high a count I figured investigation was in order.
Need to get to the bottom of this and get off the blacklist.
Chuck Tetlow wrote:
Probably "backscatter".
Someone sends a message to a random address on your server, and the
server send back a error reply if that username/e-mail address doesn't
exist. The addresses are compiled by using the book of names for
babies, and other lists - all trying to guess valid e-mail address
names. If it fails or bounces - no big deal to them. If it works, then
they have a valid e-mail address they can sell for a few pennies.
Unfortunately, in the meantime - your server is kept busy sending out
ridiculous numbers of error messages. And sometimes, can even get
blacklisted for all those error messages.
Chuck
*---------- Original Message -----------*
From: Lewis Gardner <lew...@iglou.com>
To: BlueOnyx General Mailing List <blueonyx@mail.blueonyx.it>
Sent: Thu, 28 Sep 2017 00:01:17 -0400
Subject: [BlueOnyx:21425] localhost sending 14K emails in a month?
> According to Usage Information, Email, Senders localhost on one of my
> 5209R servers has sent 13,990 emails this month. Mostly during one week
> and one other day.
>
> Is there any reasonable explanation for this behavior?
>
> What to do?
> _______________________________________________
> Blueonyx mailing list
> Blueonyx@mail.blueonyx.it
> http://mail.blueonyx.it/mailman/listinfo/blueonyx
*------- End of Original Message -------*
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