退信

• 退信提示："Relay access denied"
• 退信提示："service temporarily unavailable"
• 退信提示："Service unavailable"
• 退信提示："Temporary local problem"
• 退信提示："Server is busy"
• 退信提示："server too busy"
• 退信提示："Resources unavailable temporarily"
• 退信提示："service not ready"
• 退信提示："Can not connect to"
• 退信提示："SMTP connect error"
• 退信提示："close by peer while sending data"
• 退信提示："respond timeout or disconnected"
• 退信提示："DMARC policy reject"
• 退信提示："DKIM verify fail"
• 退信提示："SMTP error, MAIL FROM：553 SPF check refused(softfail)"