Excluding my customers that are in one list from a new list

[Anonymous]

I have a list of customers that I have previously sent emails. I am uploading a new list of prospects that may or may not contain my current customers. How can I set up a filter to include my new list, but at the same time not include any of my customers that may be in the new list by checking against the customer list?

[Anonymous]

...it would be member of a list (new list uploaded) but not a member of the existng list/smart list of customers.

[Anonymous]

Mark has it - you can also get more specific if you need to such as looking at email delivered - the list shows intent, but not that they actually got it - due to deliverability, marketing suspend, email throttle, etc.

[Anonymous]

So I tested that, I set it up like this... 
But the email still went to the leads that I put in the "Our benefits clients" that are also in the "Test Data.com" list.  Do you know what I am doing wrong?

Thanks!

[Anonymous]

 Sorry, here is the picture

[Anonymous]

Somertimes dealing with this stuff is kind of like field stripping a M-16... I would start with looking at the number of people on both lists and then see if your Smart list created by using the two filters( above) is a sub-set...I ofter find the issue at that point. If that doesn't work i start looking at activity logs of the people getting the test that shouldn't...usually this is where I find the drama.

[Anonymous]

Thanks guys!