How to Send and receive emails

I need users to be able to read both incoming and outgoing mails for their respective accounts.
I have created system users of role type employee, sales user and hr user,. With access to CRM and HR modules. The system users are associated to their respective email accounts and domain.

However, they cant receive emails. I suspect I have wrongly configured permissions. Anyone experienced to look into my user permissions and correct me? I need users to be able to read both incoming and outgoing mails for their respective accounts.

Uncheck “only if creator” checkbox and check if it works. The “only if creator” checkbox restricts users from reading mails that are not created by them.