Here's the info from their blog:
Mail art by Aaron Blecha
"We are pleased to announce that the Mail Me Art 2 exhibition will be held in London at the end of July this year!
Friday 30th July – Thursday 5th August 2010
Opening reception Friday July 30th 6-11pm
Red Gate Gallery
209a Coldharbour Lane
London SW9 8RU
All of the submissions for Mail Me Art 2 will be available to view and purchase at the exhibition. More information will be released nearer to the exhibition dates."