DSN messages are a critical part of troubleshooting e-mail connectivity issues between local Exchange recipients and issues between the local Exchange server and remote e-mail servers on the Internet.

• DSN邮件是排除本地Exchange收件人之间的电子邮件连接问题以及排除本地Exchange服务器和Internet远程电子邮件服务器之间的问题的关键部分。