[windows2000] Re: MX records question
- From: "Sullivan, Glenn" <GSullivan@xxxxxxxxxxxxxx>
- To: <windows2000@xxxxxxxxxxxxx>
- Date: Thu, 10 Jan 2008 09:48:53 -0500
Jon's absolutely right.
Each MX record has a "Priority" and that is the order that they should
be contacted.
For example, my company's MX records (from
http://www.zoneedit.com/lookup.html?host=davidclark.com&type=MX&server=&;
forward=Look+it+up) are:
davidclark.com MX 10 mail.davidclark.com.
davidclark.com MX 20 backup-mx.choiceone.net.
The first one is my mail server. The second in the ISP's "Backspooler"
mail server, that will, when configured properly, receive and queue mail
for my domain.
One important note: while the RFC says that mail senders should contact
the mail servers in order, that does not always happen. For example,
many spammers will intentionally target secondary MX servers, because
most people tell their spam software to pass-on unmolested the mail that
their backup MX servers relay.
For this reason, either make sure that there is a compatible spam
detection system running on the backup server (unlikely...) or make sure
that all mail that comes from the backup server also has to pass through
some Spam software on its way in.
HTH,
Glenn Sullivan, MCSE+I MCDBA
David Clark Company Inc.
________________________________
From: windows2000-bounce@xxxxxxxxxxxxx
[mailto:windows2000-bounce@xxxxxxxxxxxxx] On Behalf Of Ray Costanzo
Posted At: Thursday, January 10, 2008 8:45 AM
Posted To: Windows 2000
Conversation: [windows2000] Re: MX records question
Subject: [windows2000] Re: MX records question
If this what happens, this would be rather ideal for my needs. Thanks
Jon! I'm off to do some testing.
From: windows2000-bounce@xxxxxxxxxxxxx
[mailto:windows2000-bounce@xxxxxxxxxxxxx] On Behalf Of Jon Spriggs
Sent: Thursday, January 10, 2008 3:27 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Re: MX records question
If I remember rightly, MX records have a priority, so it'll try priority
1 server first (1.2.3.4), then if it can't reach that, it'll try
priority 2 (5.6.7.8 ) and so on. I think the highest priority is 100,
but different BIND/DNS servers will have more or less available records,
depending on how complex they expect their users to be!
It's usually used as follows:
Priority 1) Local Office SMTP Server
Priority 2) Main Branch SMTP Store-and-forward
Priority 3) ISP SMTP Store-and-forward
This then means that the default is for it to arrive at your branch
office. If for some reason, the downstream mail service can't see your
office (you have no power, your mail server coughs or there's just too
many connections for your local server to cope with), then it'll try
your main branch server. If that's down (same reasons), it'll try the
ISP.
Rgds,
Jon
On 1/10/08, Ray Costanzo <ray@xxxxxxxxxx> wrote:
Oops. And that second mx record sends mail to 5.6.7.8, or some other
destination different from the first record, that is...
From: windows2000-bounce@xxxxxxxxxxxxx
[mailto:windows2000-bounce@xxxxxxxxxxxxx] On Behalf Of Ray Costanzo
Sent: Wednesday, January 09, 2008 10:35 PM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] MX records question
So, here's my question. Let's say I own a domain, raysdomain.com, and I
have an mx record published that sends mail to 1.2.3.4. What happens if
I publish a second mx record? I notice in my host's dns admin control
panel, I can have more than one mx record. I don't want to try it out
to see.
--
Jon Spriggs LPIC-1 Certified
hackerkey.com://v4sw6BHUhw5ln3pr5$ck4ma3u7L$w5TUX$m5l7ADFKLRSU$i852Ne5t5
BGRSb8AGKMOPTen6a2Xs0Ir5p-2.88/0g5CMT
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