How to purchase additional mailboxes for an Open-Xchange subscription
If you already have a subscription and wish to purchase more mailboxes, please do the following:
- Login to your Namecheap account
- Click on View next to Open-Xchange Email domains
- Click on the domain name you wish to add Open-Xchange mailboxes for
- Click on Purchase additional mailboxes and proceed
Open-Xchange User Guide can be found here