title: Advanced message filter rules in Mozilla Thunderbird
body: <p>The filter mechanism of Thunderbird is nice for simple things.
  But I want to do something like</p>
  
  <p>(If message contains xy or sender is yz) and status is read, move to trash</p>
  
  <p>The problem is, one filter rule can only match any (= OR) or all (=AND)  filterconditions.
  I tried working around with that by first marking all the messages with an unprobable combination of tags in a first filter and then use a second filter to move all the marked+tagged messages to trash if they are read, but this works very poorly, as sometimes messages aren't being marked, sometimes marked messages are not deleted.</p>
  
  <p>The purpose of all this is to delete unimportant or notification emails as soon as I read them. Of course I could do a seperate filter for each of them, but if I wanted to change something, it gets tedious for all >20-30 filter rules.</p>
  
  <p>Is it somehow possible to hack into the filter configuration or is there some other way of complex filtering using only ONE filter?</p>
  
  <p>Btw. I'm using Gmail+IMAP if that could be important.</p>