![]() ![]() 503 Issue a reset if you want to start over hMailServer does not include support for the VRFY verb. If a SMTP client tries to use the command VRFY, hMailServer responds with this error code. If the client does not do this, hMailServer responds with this error message. 502 Use HELO/EHLO firstĪfter a SMTP client has connected to a SMTP server, the first thing it should do is to identify itself using the HELO or EHLO command. If a SMTP client tries to use a command which hMailServer has no implementation for, this error message is sent to the client. hMailServer does not include support for the TURN verb. If a SMTP client tries to use the TURN command hMailServer responds with this error code. This error message is issued if the domain address given in the HELO command does not have the correct syntax. This error message is issued if the domain address given in the EHLO command does not have the correct syntax. This error typically indicates a client defect or a hacking attempt. If a SMTP client sends a SMTP command which hMailServer considers beeing too long, hMailServer issues this error. This error message is issued if grey listing is enabled, and the sender, recipient and IP address triplet does not match an existing greylisting triplet. A client should never do this, but incorrectly configured clients could cause this problem. This error is generated by hMailServer if a client sends a large chunk of data to hMailServer not containing a newline character (command terminator). 421 Excessive amounts of data sent to server. The SMTP timeout in hMailServer is 10 minutes. If there is a timeout while hMailServer is waiting for a command from the SMTP client, this error message is sent to the client before hMailServer disconnects the client. used by Kerio MailServer for Internet communication.SMTP error messages 421 Connection timeout This domain name must resolve to the Internet IP address An identifier assigned to devices connected to a TCP/IP network. ) of the mail server in Configuration > Domains > 'Internet hostname'. The remote mailserver () says: "You are not who you say you are, Goodbye" Solution I'm sorry but I could not deliver your message. will then return the email to the original sender address, quoting the reason why it could not deliver the message. determines that is someone else, or does not exist and says, "You are not who you say you are, Goodbye".The following example is similar to above, however will provide a false name, and therefore will refuse to accept the message. In order to prevent spam, some mail servers will validate the name provided by the connecting mail server before allowing the message to be transmitted. In the above example, has allowed to transmit the message. acknowledges and says, "OK, give me your message".accepts the connection and identifies itself "Hello, I'm ".The following example is a simplified version of a mail server () successfully transmitting a message to connects to This identification is part of the SMTP greeting. When a message is sent through SMTP, the client and server are expected to identify each other. greeting failed because no valid DNS Domain Name System - Enables the translation of hostnames to IP addresses and provides other domain related information. ![]() Users report that some messages are returned with the explanation that the SMTP Simple Mail Transport Protocol - An internet standard used for email transmission across IP networks. Cannot send to some mail servers with the explanation that the SMTP greeting failed Issue encountered ![]()
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