[BlueOnyx:01202] Re: e-mail alias problem

[Ralf Quint]

At 09:57 AM 5/11/2009, Chris Gebhardt - VIRTBIZ Internet wrote:
>Stuart Clark (Datacenta) wrote:
> > Hi
> >
> > I recently reported that I was having problems with the aliases
> > resolving on certain sites. I have got to the bottom of the issue and
> > thought I would update the list.
> >
> > We have external DNS servers so this is not setup on the blueonyx
> > server.
> > If you create DNS for the site using CNames then any aliases will not
> > resolve.
> > If you create DNS using ARecords the aliases resolve just fine.
> >
> > It seems that sendmail cannot resolve cnames.
>
>Hey Stuart,
>I think this is consistent with RFC.   You should always be using an A
>record for your MX hosts, anyhow.

Correct, as per RFC1123.
There is a short but precise KB article from Microsoft describing the 
issue at http://support.microsoft.com/kb/153001

Ralf