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Email High Availability

I would like to know how to set this up.  Here is my senario;

Site A have Exchange 2010.  Site B is our DR site.  
Site A T1 is down (no internet, no email,...etc.)
I want to reroute my incoming emails to Site B (queues up the emails and resent to Site A, when it's back online.)
I know that I have to add an MX entry for Site B, but what HW/SW do I need at Site B to make this work.

Thank you in advance.
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Wazzume
Asked:
Wazzume
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1 Solution
 
Norm DickinsonGuruCommented:
Site B should have a working server that can run Exchange 2010 that is set up to replicate and failover. See the following Technet article for more information:
http://technet.microsoft.com/en-us/library/dd638137.aspx
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WazzumeAuthor Commented:
How can I do it without having to setup Echange 2010 in Site B.  Is there a SMTP replay (HW or SW) that I can use to hold the emails until Site A is back up.  I just want a simple solution that will hold incoming emails so that my clients will not get the NDR.  Then resend those emails when Site A is back online (either manually or automaticly).
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Norm DickinsonGuruCommented:
You may be able to set up failover to a hosted Exchange server with your ISP or someplace like Intermedia.net or Rackspace.com. If interested I can help you set that up as well. You may not need it for short term, as when the server is down the sending server will retry for a day or so. Your outgoing mail would be down, however.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Changing MX with ISP doesnt happen like a click it can take 24-72 hours to take affect as it has to be replicated to all Internet DNS server :(

As said you will also have to have a Connector where in your SiteA Exchange should flow all emails to SiteB server for external delivery ... meaning 2 Send connectors .... current one has SiteA server and Enabled .... you will have to create another Send connector with only SiteB HUB server and keep it disabled till SiteA isnt down ..... once some issue happens you will have to Manually enable it and Disable SiteA connector.

As for client or OWA or External connectivity you will have to have a Internet CAS facing as well.

- Rancy
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WazzumeAuthor Commented:
sorry, I guess I wasn't too clear.  I'm not looking to have continues emails flow.  Just to have incoming emails queues up and resend when Site A is back online.  I have a lot of clients sending emails and do not what them to get any NDR (it looks back when I'm a 24/7 shop).

As for the MX, I have the Site B as an alternate with a higher cost.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
If thats the case any email sent from internal user until SiteA is down will remain in the Queue and external email would also ideally wait for 24hrs until the recipient system says to undeliver if connection to recipient server fails.

- Rancy
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Simon Butler (Sembee)ConsultantCommented:
The cheapest solution would be to have a second Windows server in the second location, make it a domain controller and put it in its own AD site. Then install the IIS SMTP Server service, and use a product called Vamsoft ORF to provide recipient filtering.
http://exchange.sembee.info/network/smtp-gateway.asp

You can then adjust the SMTP parameters to queue the email for a longer period. Both servers can be in the MX records all the time, and legitimate email that comes in to the second MX record host will be delivered to the primary server, plus you reject email for non-valid recipients.

Although personally I would put a second Exchange server in the DR site, configured in a DAG and let Exchange do the work.

Simon.
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WazzumeAuthor Commented:
Simon, <br /><br />That's what I'm looking for, putting an IIS SMTP server.  Can't put another exchange server in DR site, need licenses for it.<br /><br />Thanks
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