Hi. We provide web/email hosting for our clients. I would like to create some redundancy in as much as a backup SMTP server for when our mail server is offline.
We use a company called www.DNSMADEEASY.com
for outgoing SMTP services and they also offer a backup mail server. But as far as I can tell I would need to purchase one for each domain that I collect emails for.
Is it possible to create an MX record for each of our hosted domains, that is a CNAME record and maps to my MX record (for which I have the backup mail service? Or have I missed something fundamental here?
I have other servers that I could utilise, how can I go about creating some redundancy on these servers so that mails are never bounced back to sender?
Thanks in advance.