Hello. I just got this suggestion today.
Mail Compose locking is like this, Let say I compose to my friend 2000 CE. But, with Mail Compose Locking technology.. I can lock this 2000 CE. So, for receiver to unlock it.. I have request a 200 000 crown. The conclusion is.. A receiver must pay 200 000 crown to unlock 2000 CE. Ughh.. I hope you guys understand. A people who want to explain it back in proper grammar and sentence are really appreciate. Thank you.
Note: The sender will get the item given back if his/her mail was been rejected by the receiver.
From what I can understand, you want to be able to send a mail with a 2000CE attachment, where the recipient needs to pay 200k cr to "accept" the CE and the 200k cr would go to you as a payment for it. In essence, secure trading by mail is what you're going for (or so I think).
I'd be all for this. I've had to wait up to a week or so to get trades through due to time zone discrepancies (no one's fault :P), and this would make it much easier to do without having to make time to log on at odd hours or put lots of faith in people you've never dealt with.
One suggestion: I'd call it "Trade Mail". I figure that may be clearer, and when the mail is sent/received it'll have that as a prefix to the title, like: "Trade Mail: Here's the Wolver Cap with UV blablabla", similarly to how Auction House mails are.
In the end +1 for ease of trading.