Know Your Anon
I found this site this morning. Just go to this page http://untitledthemes.com/knowanon and follow the instruction.
how it works? when someone send you a message as anonymous, you will receive the message with their username! but for people who aren’t logged in on tumblr will still appear as an anon.
While this doesn’t violate any of Tumblr’s terms and conditions, it’s advised you only use this if you really need to know who an anon is, preferably one sending hate, they deserve to be exposed. All this hack does is trick the sender into thinking they’re anonymously sending a message by overlaying two ask boxes.
p/s: Please make it secret, once people know they may never message you again.
pss: i’m not gonna answer question about this ok.