Error message when users use an SMTP client to send e-mail messages in Exchange Server 2007 Service Pack 1: "454 4.7.0 Temporary authentication failure"

Error message when users use an SMTP client to send e-mail messages in Exchange Server 2007 Service Pack 1: "454 4.7.0 Temporary authentication failure": "- 已使用 Google 工具列寄出"