The evidence you provided, it's not enough in terms of linking "
martincrypt02" to this accusation (you might want to add more proof regarding the deal between you two).
Based on how recent everything is, have you tried contacting him/her after receiving that email?
a) You created
this thread (WTB - Amazon SES Account) at "at 02:51:37 AM".
b) His/her last activity: "
at 04:57:51 AM"
c) You created this accusation at "at 05:25:10 AM" forum time.