How to set a custom domain.

https://mxroutehelp.com/index.php/2019/11/17/custom-domain-for-mail-webmail-and-directadmin/

You have to set these records in your dns provider. This are in amazon route 53 where I pointed the namecheap custom dns for my domain entusiasmado.com

mail.entusiasmado.com CNAME Simple - No lucy.mxrouting.net 300 - - - mailadmin.entusiasmado.com CNAME Simple - No lucy.mxrouting.net 300 - - - webmail.entusiasmado.com CNAME Simple - No lucy.mxrouting.net 300 - -

you have to set that domain.com mx record points to mx.domain.com .

In amazon you may have to put a number in front of that. 10 mx.domain.com





Go to ssl certificates

Select let´s encrypt

and then unselect the first two options like in the image: