I suspect that you have not done much reading about MiaB. I suggest doing that. To answer the question, you have two options available to you.
Set up MiaB and allow it to do DNS for all of your domains …
Continue to use your existing DNS which is considered to be ‘external DNS’ in the MiaB documentation.
In my opinion, option 2 is the better option as you are not planning on hosting any websites on the MiaB server itself.
With option 2 you will have the least chance of impact on your existing hosting’s DNS as all you will need to do is add a MX record to the existing domains. You will also need to add some txt records to DNS for things such as DKIM and SPF, etc.
With option 1 you will be basically redoing all of your DNS .
After you have read up on installation of MiaB for multiple domains, please feel free to come back with any specific questions that you may have.
Thanks for your help guys still can’t get this right now the site is down on that domain glad i tested on unused first.
Emails are sending from miab but not getting received Im on verge of giving up tbh , because i deffo don’t want my other working sites to go down.
Can someone please explain simpley because im stupid how to get it to work .
Any ideas ? or shall i start from scratch now the site is down but still need to configure mutipule domains , think il have to pay someone ;-(