What are the errors in the Linux mail server?

It is not only the mail server of Microsoft system that has error report, it also appears in the Linux system, but these error messages are generally in English or code. Generally, it is not very understandable. Now I will check the mail server for everyone. What are the common mistakes?

Q:421Servertoobusy

A: Unable to connect because of the recipient server problem, this is the SMTPsessionFull of the recipient server or because the recipient server Traffic cannot be new SMTP connection. Please resend after a while, and ask the recipient administrator if the error continues.

Q:421-MicrosoftESMTPMAILService, Version: 5.0.2195.5600readyatServicenotavailable, closingtransmissionchannel

A: The sending failure of the recipient's Microsoft ESMTP server is not working properly. Please resend after a while, and ask the recipient administrator if the error continues.

Q: 4214.3.1 ILLEGALFROMSorry.YourIPhasproblems.ThisConnectionwillbeclosed.Pleasemailtomailsysop@hanmir.com (byusinganothere-mailserver). Thankyou.

A: A transmission limit error due to a wrong IP address of the recipient. Send an email inquiry to the displayed email address.

Q: 4214.3.2YourIP(xxx.xxx.xxx.xxx) isfilteredandthisconnectionwillbeclosed.YoumustregisteryourIPtospammaster@hanafos.comBySpaceLee,theLordofmailserver

A: The sender's IP address is at www.hanafos.com The sending limit error caused by logging in as SPAM mail. Send an email inquiry to the displayed email address.

Q: 4214.3.2YourIP(xxx.xxx.xxx.xxx)isfilteredandthisconnectionwillbeclosed.YoumustregisteryourIPtohttp://realip.naver.com.

A: The sender's IP address is at www.naver. The sending limit error caused by logging in to the SPAM email on the com's website. Please refer to naver.com's spam policy.

Q:4414.4.1Noanswerfromhost

A: The recipient's mail server did not answer the failed connection. Please resend after a while, and ask the recipient administrator if the error continues.

Q:4414.4.1temporaydnsfailed

A: Errors caused by violation of hanmail.net's spam policy when connecting to hanmail.net. Please contact 1544-0580 extension 2 for consultation

Q:450:Recipientaddressrejected:Greylistedfor300seconds(seehttp://isg.ee.ethz.ch/tools/postgrey/help)

A: sender The email address is logged in on the recipient's Graylisting system and there is an error that causes the email to be sent longer.

Q:4514.4.0DNSresolvingerror

A: No error found in the recipient's URL. Please confirm that the DNS server owned by the mail server is working properly. You can try to send mail by referring to the DNS of other ISP companies.

Q:4514.3.0Otherorundefinedmailsystemstatus

A: The recipient mail system PROTOCOL error or the connected server is not an SMTP error.

Q:4514.3.0Temporarysystemfailure.Pleasetryagainlater

A: An error could not be received due to a problem with the recipient's server.

Q:4514.4.2Badconnection(iotimeout)

A: An error occurred because the recipient's response time exceeded the disconnection. Please resend after a while, and ask the recipient administrator if the error continues.