RE: Multiple MX Records
- From: <paul_lemonidis@xxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Thu, 18 Dec 2003 18:17:22 -0000
Hi all
Many thanks for all your help.
Regards,
Paul Lemonidis.
----- Original Message -----
From: John Tolmachoff (Lists)
To: [ExchangeList]
Sent: Thursday, December 18, 2003 4:37 PM
Subject: [exchangelist] RE: Multiple MX Records
http://www.MSExchange.org/
The problem is all on the receiving end. By starting a session and returning
a 421 code, they are telling your server to try again later. Your server is
doing exactly what it was told to do. There is no reason for your server to try
the other MX records. BTW, the following information is available at
http://www.networksorcery.com/enp/rfc/rfc1893.txt
4.X.X Persistent Transient Failure A persistent transient failure
is one in which the message as sent is valid, but some temporary event
prevents the successful sending of the message. Sending in the future
may be successful.
X.2.X Mailbox Status Mailbox status indicates that something
having to do with the mailbox has cause this DSN. Mailbox issues are
assumed to be under the general control of the recipient.
X.2.1 Mailbox disabled, not accepting messages The mailbox
exists, but is not accepting messages. This may be a permanent error
if the mailbox will never be re-enabled or a transient error if the
mailbox is only temporarily disabled.
John Tolmachoff
Engineer/Consultant/Owner
eServices For You
-----Original Message-----
From: paul_lemonidis@xxxxxxxxxxx [mailto:paul_lemonidis@xxxxxxxxxxx]
Sent: Thursday, December 18, 2003 5:31 AM
To: [ExchangeList]
Subject: [exchangelist] Multiple MX Records
http://www.MSExchange.org/
Hi All
Has anyone else come across this one? I have outbound messages queued up for
domains where there primary server is down. These queue up and are not
delivered which would seem fair enough on the face of it. Just one problem the
destination system has multiple MX records and the other hosts are up. Why does
Exchange refuse to use them? Even if I force the connection they do not leave?
Eventually they go of their own accord but this takes several minutes or even
hours? I cannot say at this stage if this is as a result of the primary server
coming back on line. I suspect it is.
> server 217.20.32.36
Default Server: ns1.lon.ipmh.telecity.net
Address: 217.20.32.36
> set q=mx
> mtsn.org.uk
Server: ns1.lon.ipmh.telecity.net
Address: 217.20.32.36
Non-authoritative answer:
mtsn.org.uk MX preference = 10, mail exchanger =
scanmailext.easymail.va.ifl
.net
mtsn.org.uk MX preference = 20, mail exchanger = mx1.easymail.va.ifl.net
mtsn.org.uk MX preference = 30, mail exchanger = mx2.easymail.va.ifl.net
mtsn.org.uk nameserver = dns2.rmplc.co.uk
mtsn.org.uk nameserver = dns0.rmplc.co.uk
mtsn.org.uk nameserver = dns1.rmplc.co.uk
scanmailext.easymail.va.ifl.net internet address = 213.18.255.195
mx1.easymail.va.ifl.net internet address = 213.18.248.112
mx2.easymail.va.ifl.net internet address = 213.18.248.112
>
I can telnet the second server just fine. The first one drops the connection
almost immediately. I suspect that is the answer? I am guessing that since it
does make a connection of sorts, albeit very briefly, it never tries the second
record as it thinks it is connected and thus never checks the other MX records.
Above and below are relevant screen shots.
421 SMTP service not available, closing transmission channel
Connection to host lost.
Can someone tell me if I am correct and if there is any way around this
please. I know that strictly speaking, if my theory is correct, it could be
classed as a firewall issue at the remote end but that doesn't help me deliver
mail. The only short term way I see around this is to set up an extra Virtual
SMTP server and restrict the address space to just that domain and forward to
the second record host explicitly rather than using DNS. Although that won't
help with the trapped messages I suspect?
Any ideas, comments or suggestions please?
Many thanks in advance,
Regards,
Paul Lemonidis.
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