Watermarking

[Paul Houselander (SME)]

Hi

 

I have a couple of questions regarding watermarking, I don't know if anyone
else is being hit the same but quite a few domains I look after have been
being hit by backscatter attacks over the last week.

 

I already reject all invalid recipients but these backscatters seem to be
targeting real aliases.

 

I want to use watermarks to filter out the bounces where the original
message did not come from my servers, but only on certain domains.

 

Do I just set

 

Use Watermarking = yes

 

Add Watermark = %rules-dir%/add.watermark.rules

 

add.watermark.rules

FromTo:               default no

From:    *@domain.com                yes

 

Check Watermarks With No Sender = %rules-dir%/check.watermarks.rules

 

check.watermarks.rules

FromTo:               default no

To:          *@domain.com                yes

 

Would this add a watermark for e-mail coming from *@domain.com and only
check watermarks for e-mail coming into *@domain.com - all other domains
would work as they currently do?

 

Is there any other caveats to watch out for? I seem to recall some
discussion about it misfiring on Microsoft delivery recipients?

 

Cheers

 

Paul

 

 

 

 

 

 

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