After over a decade of running my old, frozen Courier configuration on a
work host (call it "myorg.my.do.main"), with matching e-mail addresses of

u...@myorg.my.do.main

The people in my organization want to roll out a new organizational Web
server running on a different machine, and they want to be able to use

http://myorg.my.do.main/

i.e. taking over the machine name and deploying it as a Virtual IP on
another system, to be used solely for the Web server.

Which means I'll have to change the Courier machine name to something else,
like "myorg-mail.my.do.main" or something, and MX myorg to myorg-mail.

But everything else mail-wise needs to stay the same - accept mail for
myorg.my.do.main, and most importantly, continue to send out e-mail looking
like it's coming from myorg and not myorg-mail, etc.

What is the best way to accomplish this?  Do I have to use Virtual Hosts
with virtual users, and switch to "authuserdb" for authentication?

I've got existing Maildirs and a lot of time invested in my current setup -
ideally I'd like to change as little as possible (since things get unstable
very easily - for example just changing TLS_CIPHER_LIST in etc/imapd-ssl has
prevented my one remaining customer that still uses Pine/Alpine from being
able to read his e-mail).

Thanks for any advice you can give me.

        - Greg


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