1. Login to Garanntor Client Area
2. From your home interface, click on Domains in the in the middle and then select the DNS Manager option in the settings
3. Select the MX in Record type
Address: Input address
Priority: Between 0-10
Hostname: @ or domain name
For example; Setting up Gsuite on domain:
TTL: Default (14440)
Do same for all the other addresses as well varying the priority.
4. Click "Save Changes" and wait for propagation to complete.
NB: Propagation takes between few minutes to 48 hours to complete.