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add a backup smtp server

Ive got a server running small business server 2003 and exchange.

I want to setup a backup smtp server incase my goes down.

How do I do this?

I also host a webserver in the US so we have all the tools at our finger tips for changing mx records and dns entries.
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Cheryl Lander
Asked:
Cheryl Lander
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3 Solutions
 
Malli BoppeCommented:
You mean to say that if your sbs server dies then you need to pint your mails to some where elese is that right. if so then below link explains the procedure about how to do that.
http://www.amset.info/exchange/smtp-backup.asp
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Cheryl LanderAuthor Commented:
This document relates to Exchange being used as a backup server.

I need the web host to be the backup server and exchange to be the main (first) server.
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Malli BoppeCommented:
I don't think you can have a web host as  backup server.only thing is point you mx records to your web host.
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tigermattCommented:
You could simply add an MX record pointing to your web host's mail server, with a higher cost than the one going to your server. However, that's a bad idea, because you're going to have to create mailboxes at your web host for every address on your exchange server, or use a catch-all account which means a lot of administration afterwards.

Instead, you should really be looking at why you need to have it going to the web host instead, and why you think your server might go down. If it's really critical that you have a backup then I would get a second exchange server, (I think you'd need to migrate to a 2003 Standard domain first though) install it into the existing organization then you won't get the problems you've got with if you used the web host.

Also, don't forget that any well-configured mail server will try for up to 48 hours to keep sending the message, so if the server is only down for a few hours it shouldn't be a problem.
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Cheryl LanderAuthor Commented:
This is what Ive received by the web host.

I dontknow what do with this.

You do not want to add the Exchange server to your MX records, because then some mails will be delivered to your web host, and some to your Exchange server. What you would want to do is to create a hostname like smtp.yourdomain.com, and configure it to do load balancing between your Exchange and webhost server (e.g. http://content.websitegear.com/article/load_balance_dns.htm), then configure your users' email software to use smtp.yourdomain.com instead of mail.yourdomain.com and you would need to make sure that your users with mail normally hosted on the webhost will be able to authenticate and send mail properly from the Exchange server. We would not be able to support you in configuring Exchange or your DNS settings.
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tigermattCommented:
Load balancing between the web host and Exchange is a bad idea, since they are two separate systems, so you'd have to maintain two separate sets of mailboxes, email addresses etc. Think about the administration nightmare!

From what they've said "You do not want to add the Exchange server to your MX records" it sounds like you don't already have Exchange on the MX?

In my above post I did state that most mail servers will retry for anything up to 48 hours, so unless you expect your server to be down longer than that it shouldn't be a problem.
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Cheryl LanderAuthor Commented:
There are onyl 3 mailboxes on the domain. SO I will have to deal with the administration side of things.

SO how do I do this?
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tigermattCommented:
Well the easiest way would be to have your ISP, or the person/company managing DNS for your domain name, to setup a second MX record. Obviously the first record is pointing to the address of your exchange server. Get the second one set up so that it points to the address of your web host's mail servers, BUT make sure that the cost is higher than the cost of the MX record to your exchange server.

The cost specifies which MX record takes preference. A lower cost = higher preference. If the highest preference server cannot be reached, then it tries the next one with a higher cost (lower preference) and so on.

You'll either need to set up 3 mailboxes at the web host with email addresses matching the ones on exchange. Alternatively (the way I would probably do it) set up a catch all account, basically an email address which "catches" all mail sent to the domain if it doesn't have a mailbox specifically for it to go to.

If this does get used you'll have to be able to login through webmail or download with pop3 to a separate exchange mailbox/pst to be able to forward it onto your exchange users when exchange comes online.
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Cheryl LanderAuthor Commented:
When you say cost you mean order. Is this correct.

Example.
Ns1= exchangeserver ip
ns2 = webhostip.

Problem is, at the moment I have two ns records for the domain.
So do I have to setup up a ns record for smtp.mydomain.com and then put this as ns3. And do I do this via my domain registrar.

For example
Ns1= exchangeserver (ip)
ns2 = webhost (ip)
Ns3 = smtp.mydomain.com (ip)
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Malli BoppeCommented:
He meant to say the order of XM recorsds not the name server.
NS stands for name server and is a public dns server on which the various records are created and one of this a mx record which tell where the mail to go.
to find out the mx records for your domain
 go go command prompt type nslookup
set type=mx
type your domain name
 this should provide information as below

Non-authoritative answer:
domain name     MX preference = 10, mail exchanger = mail.domain.com
domain name     MX preference = 30, mail exchanger = webhost.domain.com
 
In the above example the fisrt record is where the email would try to go.
More info about mx records
http://www.petri.co.il/configure_mx_records_for_incoming_smtp_email_traffic.htm
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tigermattCommented:
Apologies for not getting back to you on this one. If you follow the above information, that should get you up and running.

tigermatt
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Cheryl LanderAuthor Commented:
I dont quite know where to put this information.

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Malli BoppeCommented:
You need to contact your ISP or whereever your domain is hosted about setting up the mx records
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