MailScanner custom header modification

[Jerry Benton]

This is called backscatter. Read here: http://en.wikipedia.org/wiki/Backscatter_%28email%29 <http://en.wikipedia.org/wiki/Backscatter_(email)>

Here is an article that outlines how to deal with it: http://www.rackaid.com/blog/how-to-stop-email-backscatter/ <http://www.rackaid.com/blog/how-to-stop-email-backscatter/>


-
Jerry Benton
www.mailborder.com



> On May 21, 2015, at 2:48 PM, Shawn Iverson <IversonS at rushville.k12.in.us> wrote:
> 
> Why not just reject external mail addressed to your domain instead?
> 
> If it has your address on it and it is not coming from you, then it is not yours.
> 
> Postfix/Exim/etc. support this feature.
> 
> On Thu, May 21, 2015 at 6:00 AM, Арсений Черняков <a.v.chernyakov at gmail.com <mailto:a.v.chernyakov at gmail.com>> wrote:
> Hello.
> We've deployed MailScanner as an email relay and virus/spam scanner.
> We've encountered some messages that sent from various external servers with "from" header set to our domain and rcpt-to set to various free mailservers such as outlook.com <http://outlook.com/>. There is a plugin to spamassassin that detects such messages and increaces spam score.
> There is need to somehow modify Subject of such emails with [FRAUD] stamp (for example) like SpamAssassin modifies it with [SPAM] stamp. Is it possible to do with MailScanner?
> Or maybe there is another way to do it?
> 
> Thank you.
> 
> 
> 
> --
> MailScanner mailing list
> mailscanner at lists.mailscanner.info <mailto:mailscanner at lists.mailscanner.info>
> http://lists.mailscanner.info/listinfo/mailscanner <http://lists.mailscanner.info/listinfo/mailscanner>
> 
> 
> 
> 
> 
> -- 
> Shawn Iverson
> Director of Technology
> Rush County Schools
> 765-932-3901 x271
> iversons at rushville.k12.in.us <mailto:iversons at rushville.k12.in.us>
> 
> -- 
> MailScanner mailing list
> mailscanner at lists.mailscanner.info
> http://lists.mailscanner.info/listinfo/mailscanner
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mailscanner.info/pipermail/mailscanner/attachments/20150521/4b9a1b13/attachment.html>