[BlueOnyx:21429] Re: localhost sending 14K emails in a month?

[Lewis Gardner]

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 <lewisg at iglou.com>
> To: BlueOnyx General Mailing List <blueonyx at 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?
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> *------- End of Original Message -------*
> 
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