[CentOS] Centos 6 Sendmail backup MX Config

[Ken Smith]

Ken Smith wrote:
> Hi All,
>
> I'm just wanting to check that my understanding of the settings is 
> correct as my web searches are finding a lot of dated information.
>
> If I want a Centos 6 sendmail system act as the secondary MX for 
> domain bbbbb.co.uk do I just add a
>
> Connect:bbbbb.co.uk               RELAY
>
> statement into /etc/mail/access and restart sendmail
>
> Obviously I have the DNS MX records for the domain are already 
> established.
>
> I've been getting "/config error/: /mail loops back to me/ " errors.
>
> I think I may be stumbling into a variant of cname problem where the 
> hostname as far as the sendmail machine is concerned is aaaaa.com but 
> the DNS setting for the secondary MX is smtp1.bbbbb.co.uk.
>
> They both resolve to the same IP but when sendmail looks up the MX 
> records for bbbbb.co.uk it will find smtp.bbbbb.co.uk and 
> smtp1.bbbbb.co.uk listed and it may relay the mail off to 
> smtp1.bbbbb.co.uk without recognising that aaaaa.com = 
> smtp1.bbbbb.co.uk. Am I on the right track here, as I then just need 
> to change the secondary MX setting in DNS to aaaaa.com?
>
> Many thanks
>
> Ken
>
>
>
I've changed the secondary MX record for the domain and I'll see if the 
problem goes away.

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.