Not really what you asked for, but why not use outlook rules to move these emails? If you start an email "where to go for lunch" add that as a rule to move these to a folder. You can even always insert [vote] into a subject line, and move these out without ever looking into the rules again.
This option is in outlook, on ribbon go to file, info, rules & alerts.
I solved it by my own. I needed a code not any newbie's outlook advise btw
If TypeName(item) <> "MailItem" Then
Cancel = False
Exit Sub
ElseIf Left(item.Subject, 3) = "Yes" Then
Cancel = False
Exit Sub
ElseIf Left(item.Subject, 2) = "No" Then
Cancel = False
Exit Sub
End If
That is indeed a very useful code, if you are OK with only Yes and No voting buttons, and with every email beginning with 'No' to be thrown out, ones titled, for example "NOTE ON THE VERY URGENT MEETING YOU NEED TO ATTEND THIS MORNING"
That is a very professional code you've built all by yourself.