First of all thanks for your helpful feedback. The “email body is known” is a good rule definitely.
The only issue with that, is that I cannot really use lists as a way to filter data in Reports.
So I have this other workaround:
1) I create a new VIEW in Contacts with the rule “Last contacted is known”
Probably it includes also contacts via phone , meetings, etc. But since I don’t do any call/meeting without a mail , then I think it can work.
2) As a result, if I create a Report I have the option to use “contact filters” corresponding to my custom VIEWs to get specific segments of data. I could not do something similar with Lists so far… . Hope it helps and interested to know your feedback!
