prezactly > From: "Dean Cunningham" <[EMAIL PROTECTED]> > Reply-To: "Exchange Discussions" <[EMAIL PROTECTED]> > Date: Tue, 09 Sep 2003 12:41:18 +1200 > To: "Exchange Discussions" <[EMAIL PROTECTED]> > Subject: Re: Delivery to Alternate MX Records > > IMNSHO their logic is screwed. The MX records work as follows > > Get me a list of MX records for the domain seanet.com [done] > Can I connect to highest priority MX record ? > Yes = try and send the email > No = try next MX record > > Under Yes, if having trouble sending email , exchange server retries but > because server can always connect to highest priority MX record, it will keep > choosing to use that one until the message holding peroid for your exchange > server times it out and sends the message back to the server. > > The people at seanet.com need to block port 25 for their server with the > highest priority MX record. this will then force the exchange server to use > the next available MX record. > > Whilst not exactly explained see > > ftp://ftp.rfc-editor.org/in-notes/rfc2821.txt > and > http://www.rfc-editor.org > > for a 452 error your sherver should be (and is ) reacting as follows > > 4yz Transient Negative Completion reply > The command was not accepted, and the requested action did not > occur. However, the error condition is temporary and the action > may be requested again. The sender should return to the beginning > of the command sequence (if any). It is difficult to assign a > meaning to "transient" when two different sites (receiver- and > sender-SMTP agents) must agree on the interpretation. Each reply > in this category might have a different time value, but the SMTP > client is encouraged to try again. A rule of thumb to determine > whether a reply fits into the 4yz or the 5yz category (see below) > is that replies are 4yz if they can be successful if repeated > without any change in command form or in properties of the sender > or receiver (that is, the command is repeated identically and the > receiver does not put up a new implementation.) > > cheers > dean > > > > >>>> [EMAIL PROTECTED] 9/09/2003 11:28:04 a.m. >>> > Hi All, > I'm a bit puzzled by something and I'm hoping that someone can help out. > There's a particular domain, seanet.com, that we can't send messages to at the > moment. Any message sent to this domain hangs in the IMC queue with the error, > 452 4.3.0 Cannot write message to disk. According to this ISP's support group > they've recently reconfigured their main mail server so it can no longer > receive messages from the outside world, and I assume that the error we're > seeing is a result of this reconfiguration. They further claim that our server > should try to deliver messages to their second or third mail server, something > it definitely isn't doing. > > So here are my questions. Should an Exchange server (5.5, by the way) try the > next MX record after getting a 452 from the primary server, and are there any > settings in Exchange that affect this behavior? As an additional philosophical > question, does it strike anyone else as strange that they should deliberately > put an essentially malfunctioning server at the address of their first MX > record in the name of spam fighting and security? > > -Peter > > > > > > ********************************************************************** > Northland State of the Environment Report 2002 > now online at www.nrc.govt.nz > ********************************************************************** > NORTHLAND REGIONAL COUNCIL > > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please notify > [EMAIL PROTECTED] > ********************************************************************** > > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Web Interface: > http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang=e > nglish > To unsubscribe: mailto:[EMAIL PROTECTED] > Exchange List admin: [EMAIL PROTECTED] >
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