You can easily purchase additional mailboxes for Titan Mail by opening the Emails section and selecting your domain:
And clicking Buy Email Accounts:
You will be presented with a pop-up window, where you will be able to purchase additional email accounts with just a few clicks:
All of your email mailboxes have to have the same expiry date. For example, you purchased 1 email account for 24 months for $20 and after 4 months of usage, decided that you need 4 extra email accounts for 2 years for $80, so in the end, the calculation will be the following:
20 months (the time left on your current subscription) * the difference between the previous and new plan prices (20/80=0.25) + 24 months (new order plan) = 5 + 24 = 29 months. That will be your final expiration date for your 5 email accounts.
That’s it, now you know how to add additional mailboxes to your email account 😊