1.A number of MUAs, MTAs, and spam-filtering tools already do a good job of working with hashcash, but significant gaps still exist.
有很多MUA、MTA以及垃圾邮件过滤工具在使用bashcash方面已经做得很好，不过它们之间仍然存在明显的鸿沟。
2.Fom Mua stands in his temporary camp in the mountainous jungles of Laos.
马福站在他的临时帐篷前面拍照留念。
3.A good MUA or spam-filtering system might whitelist e-mails with valid hashcash stamps.
一个好的MUA或者垃圾邮件过滤系统可以将拥有合法hashcash戳记的电子邮件列入白名单（whitelist）。
4.Use mutt as the mail user agent (MUA) in combination with vim.
用mutt做用户邮件代理（MUA）与vim结合使用。
5.MUA which is the program a user actually uses to compose and read mails.
MUA，这是用户发送和读取邮件的程序。
6.MUA Maintenance oriented group Unblocking-Acknowledgement message
面向维护的群解除闭塞证实消息