Hey guys, so I'm complete newbie to both VBA and outlook scripting. I'm trying to cross check a list of email addresses against active email addresses. Basically, when I create a new email with a non-existing user, I get this:

I want to make a new list with all the users (from existing list) for which I get an error message as above. Problem is I don't know how to check for that error message. Any ideas?

 

I've tried using ResolveAll but it returns true for any string such as yy@zz.tt..  Perplexed