Exchange 2003 Smtp Error 421
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not send your message. Error 421." - Meaning of the Numbers Have you ever tried wondering what the codes actually mean? Or have you thought, if these numbers do exchange 2003 an smtp protocol error occurred make some sense? Or if they might mean something which could help you
Smtp Error 421 4.3.2 Service Not Available
identify with the issue. Very often you encounter this in your mailbox. I intend just giving a small heads-up
Smtp Error Code 421
in understanding the meaning or interpreting the error codes which might help in making sense as to where the trouble could be. Primarily you will get the error code with three
Smtp Transient Error 421
numbers as I showed above Error 421. First Number: This lets you know whether the server has accepted the command and was capable to handle it or not. Let me address you the possible meanings of the first number in the error now. 1: The server has taken the command, but it's not executing it. Here you need a confirmation message. 2: smtp transient error 421 service not available ora-06512 The server was able to complete the task. 3: The server was able to understand the request but feels it needs more information to complete it. 4: The server faces a temporary failure here. If you try executing the command again, it may complete. At times, mail servers use such temporary failures to keep security higher. 5: The server actually has the error and you should attempt it. Second Number: This gives a little more information. Let me address you the possible meanings of the second number in the error now: 0: This indicates that a syntax error has taken place. 1: This indicates an informational reply, for example to a HELP request. 2: This indicates your connection status. 3 and 4 are unspecified. 5: This indicates your status of the mail system as a whole and the mail server in particular. Third Number: The last number is the key. It pertains more to mail transfer status. This actually relates to the detailed list of ESMTP server response codes, as laid down in RFC 821 and later extensions. 211 - This indicates a system status message. 214 - This indicates t
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Display results as threads More... Useful Searches Recent Posts Menu Forums Forums Quick Links Search Forums Recent Posts Menu Log in Sign up AnandTech Forums: Technology, Hardware, Software, https://forums.anandtech.com/threads/getting-421-server-error-when-telneting-into-port-25.37940/ and Deals Forums > Hardware and Technology > Networking > Getting 421 Server error when telneting into port 25 Discussion in 'Networking' started by Brazen, May 16, 2007. Brazen Diamond Member Joined: Jul 14, 2000 Messages: 4,259 Likes Received: 0 Ok, so I'm trying to figure out why email is not going through, if that wasn't obvious. So from our email server, I try telneting error 421 into their email server with no luck. I think maybe it is a problem with our server, so I open up outgoing port 25 on the firewall from my laptop and try it from there with the same result. I try telneting into some other email server out on the internet and it works just fine. This may lead you to believe it's their server having smtp error 421 a problem, BUT I take my laptop off our network and plug it directly into the internet with a spare public IP address (for just such occasions) and try telnetting to their email server gain, and IT CONNECTS! So the problem is only between our main network and their server. Any ideas? Edit: I also just checked our firewall logs and it did not have anything about it blocking the connection. So I don't think our firewall is the culprit for any odd reason. #1 Brazen, May 16, 2007 TheSiege Diamond Member Joined: Jun 5, 2004 Messages: 3,822 Likes Received: 1 probably your ISP or a firewall, im willing to bet its the ISP #2 TheSiege, May 16, 2007 DaiShan Diamond Member Joined: Jul 5, 2001 Messages: 9,617 Likes Received: 0 Have you asked the remote admin to check their firewall rules? It's very easy to block access to a port for a single IP address in something like IP tables, in fact I use a script to automatically drop packets destined for port 22 by abusers (those who fail on login more than 5 times) based on their IP address. It r