Liste de diffusion Message #15428
De: Todd Reed <>
Sujet: Re: SIMS dual domains
Date: Wed, 07 Feb 2007 10:45:18 -0800
A: SIMS Discussions <>
Great, thanks for the replies. That about covers it for me.


On 2/7/07 9:45 AM, "Christopher Bort" <> wrote:

> On 02/07/07 at 06:28, Todd Reed wrote:
>> Hi all,
>> Still running SIMS here despite all rumors to the contrary.
>> I need to run dual domains on SIMS as the organization is moving to a
>> new domain name. We want mail sent to or
>> to both go to the same user mailbox.
>> My checklist is as follows:
>> Turn down TTL's on existing domain.
> Why? If you follow your plan outlined below, the existing MX,
>, will continue to point to your mail server without
> interruption, no? Whether a sending MTA uses a the old A record from a
> cache or gets the new CNAME, it will still resolve to the IP address of
> your SIMS machine. Unless you're changing the IP address of your server,
> but it doesn't sound like that's the case.
>> Establish new domain with A, and MX records pointing to SIMS.
>> Give SIMS it's new domain name:
>> Set up a routing entry: *
> That should be:
> <*> = *
> However, if all user names are the same for both domains, you can simplify
> that to:
> =
> Put this at the top of your router, above any entries that route individual
> addresses within the domains.
>> Set up CNAME on old domain name record:
>> Remove A record for
>> MX record on old domain points to
> That's all optional and entirely up to you. The record for
> can remain as an A, especially if you're reasonably
> confident that your server will keep the same IP address for a while.
> CNAMEs can get messy, so I usually try to avoid them when an A record will
> do the job.
> More to the point would be to simply change the MX record for
> to point to (an MX does not have to be in the same
> domain):
>   MX   10
> Again, you don't need to fiddle with TTLs here because
> and will point to the same IP address. If you make
> the MX for, then you can remove the
> A|CNAME for entirely after its TTL expires.

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