Certified electronic mail protocol可认证的邮件协议
certified electronic mail电子保证邮件;证实电子邮件协议;挂号邮件
Certified mail server保证邮件服务器
CERTIFIED OR REGISTERED MAIL挂号信
Sent Certified Mail发送确认邮件
Digital certified Mail数字认证邮件
Registered Certified mail注册会计师的邮件;注册认证邮件;注册的认证邮件
certified mail protocols认证邮件协议
certified E-mail protocol挂号电子邮件协议;可证实的电子邮件协议