Requirements to add external user

Requirements to add external user

Hi there,
which subscription plan do I require from Zoho in order to add an external user/ guesst to my mail account?
I want the guest user to do general email work/ replying/ follow-up on orders. In best case I can set also some rules what is may not allowed (e.g. deleting mails).

Do I have to add another user for 19.95S$ per year?
Hi Support-Team,
Which subscription plan do I require from Zoho in order to add an external user/ guesst to my mail account?

Do I have to add another user for 19.95S$ per year?