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Can't send emails to recipients of same company, between two exchange servers in seperate offices.

Posted on 2006-06-29
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OK so here’s the deal:

I just inherited a network from another admin; this company has two offices, one in Los Angeles and one in San Francisco. Each of the offices has their own Windows 2003 Small business server and their own internal domains (SFDomain.local & LADomain.local). However, the two offices share one Public email domain name (company.com). The MX records for this domain point to the server down in LA, so all emails are delivered that server.

The LA server has user accounts/mailboxes (on the LADomain.local domain) for ALL the employees in both offices. The SF server only has user accounts/mailboxes (on the SFDomain.local domain) for the SF users.

The LA users have outlook configured for their exchange mailboxes that reside on the LA server.

The SF users have outlook configured with two accounts; the first is for their exchange mailbox on the SF server and the second is a POP mail account (where the LA server is the POP & SMTP server) used to download all their emails off the LA server.


Now here is the problem:

When SF users (SF_user@company.com) send emails to LA users (LA_user@company.com) from their exchange account we get a bounceback because the SF Exchange server does not have any LA users’ accounts/mailboxes. If the SF users send the email from their POP mail accounts (where the LA server is the POP & SMTP server) the email gets to the recipients just fine.

What’s even worse is that if the SF Users log into the SF server remotely using OWA they can’t send any emails to LA users because their POP mail accounts are not accessible through OWA.


I just want to know if there is a better way to configure these two servers to talk to each other. I know we can’t create a single internal company domain due to restrictions requiring us to only have a single Windows 2003 Small business server on a domain, but there has to be a better way for the exchange servers to talk to each other. Is there a way that the SF Exchange server can forward all emails addressed to LA users directly to the LA server? Is there a way for the two exchange server to synchronize with each other? Any thought, inputs, or suggestions would be greatly appreciated.

Thanks in advance!
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Question by:sfadmin
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Sembee earned 2000 total points
ID: 17016993
The ideal scenario would be a single domain. You haven't said how many users you have, but in many cases like this, putting all the users on one server is enough. Outlook 2003 in cached mode with RPC over HTTPS is very bandwidth efficient, and as you are using SBS, you can have at most 150 staff over both sites.

Otherwise, it is down to some SMTP tricks.
I have a process outlined on my web site here: http://www.amset.info/exchange/twositesonedomain.asp
Plan it very carefully, it does work, just takes some planning and leg work to get running. Once it is running, the management of the system is very straight forward.

Simon.
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