4211. Service Not Available, Closing Transmission Channel [this May Be a Reply To Any Command If the Service Knows It Must Shut Down] 2. Service Not Available - the Sending Email Program Should Try Again Later括号内的主机无法提供正常的邮件服务,关闭传送管道,邮件将滞留在主机上 收信者端邮件服...
SMTP错误码/建议解决方法错误总表4201. Timeout Communication Problem Encountered During Transmission. Thie Is a Novell Groupwise Smtp Error 2. Tcp Read Error 3. Tcp
关闭Open Relay 3. 开启SMTP AUTH 身 SMTP 服务太过繁忙;可能被当垃圾信跳板服务器。 份认证 Read Error From Mail.mail.xxx.xxx.xxx 读取错误自邮件服务器 451 可能是DNS 指向设定错误。 1. 请检查DNS 是否正常运作 451 Domain of Sender Address Xxx@xxx.xxx Does Not Resolve 无法解析送信者邮件信箱所...
关闭Open Relay 3. 开启SMTP AUTH身份认证451Read Error From Mail.mail.xxx.xxx.xxx读取错误自可能是DNS指向设定错误。1. 请检查DNS是否正常运作451 4.1.8Domain of Sender Address Xxxxxx.xxx Does Not Resolve无法解析送信者邮件信箱所属的网域DNS的问题比如需要做DNS反解。通知邮递员并检查DNS设定是否正常。
What is SMTP relay? 03 How does SMTP relay work? 04 What are the types of SMTP relay services? 05 How do you test your SMTP relay server? Conduct an overall check Use free internet tools Run a manual test Check if you have an open SMTP relay; if so, close it ...
Sustained, unusually high rates of incoming messages may be an indicator of a denial-of-service attack or a spam attack. Check to see whether the SMTP Inbound Server is configured as an open relay. Change the logging level of the SMTP Inbound Server to the Notification level. Check the se...
Authenticated SMTP relay is the process of verifying the sender’s credentials before processing and relaying the email. This process aims to secure your email delivery, as unwanted parties can’t register with an authenticated SMTP relay server. Open mail relays don’t have the same security ...
behalf. Open relay means the SMTP server is routing both messages from external sources and internal server mail, while closed relay only routes messages generated on the internal network or server. By its nature, open mail relay is more expansive, but it can also be more vulnerable to spam ...
SMTP email relay service that is powerful, secured and reliable. Send better transactional emails and integrate easily with our email API.
STARTTLS first. The server wants the authentication process to take place under the SSL layer. MS Exchange 2010 is an example. The server may be configured to act as an open relay for the given IP address of the client. Typical case with intranet networks. ...