ArtTrader Magazine: http://www.arttradermag.com Is an art/mailart magazine available free online,
I'm a contributing editor, and we are always looking for folks to submit article proposals or their art or mail art! :) Note me if you have an article idea!!!!
Also check out ATCfanatics (https://www.deviantart.com/atcfanatics) :boogie:
I am a member of:
ACEO-Addict (https://www.deviantart.com/aceo-addict)