退信

• 退信提示："UnKnown can't find abc.com： Non-existent domain"
• 退信提示："Unable to relay"
• 退信提示："host denies relay"
• 退信提示："server doesn't supply open relay"
• 退信提示："isn't allowed to relay"
• 退信提示："isn't allowed to be relayed"
• 退信提示："relay not permitted"
• 退信提示："Relay Deny"
• 退信提示："unable to relay"
• 退信提示："relaying denied"
• 退信提示："relay is not allowed"
• 退信提示："this message is looping"
• 退信提示："smtp auth error limit exceed"
• 退信提示："too much fail authentication"
• 退信提示："Delivery not authorized"