Can I pay a Zoho Basic account for just 1 member of my domain ?

Can I pay a Zoho Basic account for just 1 member of my domain ?

Hi !

So, I´ve been using Zoho Mail free tier for s year and it´s a great service.
I have around 10 accounts but only one send around 20 - 40 emails a day. 
Sometimes this user get his account blocked because of this.

Can I pay only one single Basic subscription for this user? 
Thanks
Bye.