General discussion



By Shanghai Sam ·


Externally hosted DNS + mailboxes on a UNIX server
SMTP addresses:
Exchange 5.5 server SP4 not connected to the Internet (Intra-office mail. Outlook is configured with offline folders and POP3 option to download external mail)


Windows NT 4.0 SP6a (DOMAIN: CHICAGO)
Exchange 5.5 server SP4
Internet Mail Connector (registered domain name:
Do you see any problems configuring the Internet Mail Connector with this internal/external mail scenario?

SMTP: addresses of each user will be IS IT NECESSARY FOR THE EXTERNAL SMTP addresses to match THE INTERNAL ONES?

1. What else needs to be done on the UNIX or Exchange Server to set up some kind of a fault tolerance in case the Exchange server goes down besides 2 MX records (the UNIX box with lower priority)

2. We are trying to have all mail directed to the Exchange server. In case it wentdown we want all the e-mails to be directed to the UNIX box. We don?t know how it will be retrieved after the Exchange server comes back on line?

3. Do we have to set up some kind of a forwarder on the mail servers (which server UNIX or Exchange?) or just to enable POP3 Internet e-mail within Outlook?

4. If forwarders are the way to go how is it going to work when the Exchange server is down? Is the forwarder going to just keep trying until the Exchange is back on line?

5. If the POP3client is the way to go how is it going to affect outgoing mail if the OFFLINE folders are enabled and the Exchange server is down. Isn?t it going to make sending outgoing (without the Exchange on line) mail impossible?

PLEASE, REPLY IF ANY OF YOU HAVE HAD ANY LUCK implementing a similar solution? Maybe, you know something better?

Thanks a lot,


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by McKayTech In reply to EXCHANGE-UNIX FAULT TOLER ...

I don't know that this is any better, but I currently work with an e-mail system using Exchange and a mail relay server. The primary MX record points to the mail relay server and the secondary MX record points directly to the Exchange server. If the mail relay server goes down, incoming mail goes directly to the Exchange server but outbound mail is held until the mail relay server comes back up. If the Exchange server goes down, the mail relay server holds the incoming mail until the Exchange server is back up and then automatically delivers it.

It's fault-tolerant in the sense that no mail gets rejected or lost, but it does not maintain full functionality and flow during an outage.


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