This is sorely needed
I think some of the responders are missing the point of a blacklist app.
I don't want to have to filter email at the point of gmail itself. This is because filtering that way would affect my desktop gmail reading experience. I like my listserv emails in my desktop reading experience, and I like those emails in the regular inbox -- I don't want to have to click anything to see them. I don't want them separate when I am on my large screen that provides me ample reading room to see them within the context of the rest of my email.
But those lists send out lots of messages. Simply put, I don't want to get alerted on my phone to each of these messages. I hate to say that Blackberry got something right, but their BIS system allowed you to setup a simple filter based on the subject or sender. They served as a middleman between gmail and your BB.
The bottom line is: I shouldn't have to resort to filters/labels/etc if I just want to stop certain senders' emails from notifying my Android device.
I just don't get this whole style of responding that takes the form of "Oh, that's not how you should do it, do it this way this way". The OP wasn't asking for your advice on their email reading habits, they were asking for a blacklisting application. Unless you can filter email at the gmail locus without it effecting the gmail reading, then any other is not what the OP wanted. I hate to sound trite in my response, but reading through message boards becomes tedious when I have to scroll through "Your desire for the feature is misplaced".
