The thing about the address is the plugin uses that to determine where to send the mail. I may make the addresses formattable in a config file in the future though.
Version: 1.2
Post boxes do not appear but it's a good idea and it would be great to see the source code because for myself I want to change that /sendmail user true message
That is unnecessary long. I'd do it that way: /sendanon and /sendmail
Post boxes cannot appear, as you have to build them by placing a box on a post. As for the command, that's more of an admin command not intended to be used by players.
Version: 1.2
Players enjoy this small gimmick on my server, its easy to install and use! Only down side is you are not told if the mailbox has mail inside it. Cant wait to see what get added next.