ForwardMX can be used with any DNS service that allows custom MX records (which is pretty much all of them).
All you have to do is to find the DNS settings and add 2 MX records with the following values:
mx1.forwardmx.io - Priority: 10 mx2.forwardmx.io - Priority: 20
After that our service can pick up the changes and enable your domain for receiving emails.
These changes are effected automatically as soon as the DNS settings have changed. These takes between minutes and 48 hours. (It is worth noting that it does take only a few minutes with most DNS services)