SMTP Status Codes and Error Messages from Error 420

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SMTP status code – 420 – Timeout communication problem encountered during transmission. This is a Novell GroupWise SMTP error
(also called SMTP Error 4.2.0)
SMTP Error 420 : In our experience only Novell
GroupWise servers use this error (we use GroupWise!).
You will get a GroupWise GWIA (GroupWise Internet
Agent) 420 TCP Write Error or 420 TCP Read Error if
there are communication problems during transmission of
the actual message after the sending and receiving servers
have actually connected. A small number of 420 SMTP
errors is normal as occasional peaks of Internet usage may
delay the transmission of an email with attachment so
much that a timeout occurs. When a timeout occurs on a
GWIA send, the message is queued up in the
<Domain>\WPGATE\DEFER directory for processing at a
later time (as defined in ConsoleOne or GWIA.CFG).

If you experience 420 errors only with specific
recipient then it is quite likely that the recipient’s antispam
firewall does not like your server, your server’s
external IP address, or that your server’s HELO command
uses an outbound identification that does not match your
server’s external IP address (check that your sending
domain’s DNS is set up correctly). In an ideal world a well
behaved recipient server should really be issuing your
GroupWise server with a 554 error rather than timing out
and causing the GroupWise GWIA to fault with a 420 error.
If you experience too many 420 errors with all email
communications, then you have a physical
communication problem somewhere. This could be

your server’s network card, the network point that your
server is plugged into, your switch(es), your router(s),
your firewall, or your Internet line – problems caused by
routers with different MTU sizes is a classic issue. Unless
the logs of all those various problem points can give you
an instant answer, the only way you will get to the bottom
of the problem is to use a packet tracing and inspection
program like Ethereal or Wireshark, its successor, if
you’re running GroupWise on a Windows or Linux server;
on NetWare your only choice is PacketSScan which you
can get here
http://support.novell.com/docs/Readmes/InfoDocument/2967287.html.
In the final analysis, if the tracing of packets, and the
changing of hardware does not help then do not discount a
slightly faulty hard disk being the cause of all your
problems (even if your RAID controller or your hard disk
testing software does not detect any problem!).

Above are list of SMTP Errors Codes and Status Codes along with Error and Warning messages from Error 420 received while performing certain operation against mail server applications or related products.

What are SMTP Error Messages?
Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission. SMTP protocol is used for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP.

In general, each SMTP error contains the following information:
• The SMTP Status Code or SMTP Error Codes or SMTP Reply Codes
• The message text. This text is usually returned with the Error code. Some messages employ word substitution, where the word substituted represents the system-replacement of a term more specific to the occurrence.
• An explanation of how the error may have occurred.

Hope this was helpful.

Thanks,
SQLServerF1 Team
Information about SMTP Error Codes or Status Codes and Error Messages on Windows, Linux Operating Systems.

 

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