RE: Multiple MX Records
- From: <paul_lemonidis@xxxxxxxxxxx>
- To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
- Date: Thu, 18 Dec 2003 15:55:52 -0000
Hi Al
Many thanks for your prompt reply and help. Sorry I should have said. I am
running Exchange 2003 Build 6.5.6944.0 on Windows 2003.
From what you say it sounds like I may have to wait for a hotfix or service
pack to resolve this? Having said that I do seem to remember we did have the
problem on our old Exchange 2000 machine which had SP3 with the latest rollup
package. Fortunately it is not a major problem at present. Whilst it could be
me firewall my gut feeling is that it is not. Unfortunately I have no way to
prove or disprove that statement at present.
May thanks in advance.
Regards,
Paul Lemonidis.
----- Original Message -----
From: Mulnick, Al
To: [ExchangeList]
Sent: Thursday, December 18, 2003 1:51 PM
Subject: [exchangelist] RE: Multiple MX Records
http://www.MSExchange.org/
If I recall correctly, there was an issue similar to this that was fixed in
later releases. The problem was with the underlying SMTP (I think; it's been
some time). What versions of OS and app are you running?
The issue was something to do with the way the SMTP service would use MX
records. It was very similar to what you describe.
------------------------------------------------------------------------------
From: paul_lemonidis@xxxxxxxxxxx [mailto:paul_lemonidis@xxxxxxxxxxx]
Sent: Thursday, December 18, 2003 8:31 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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