Should multiple user accounts be allowed to use the same email address?

1. Can multiple users use the same email address?
2. Can I have 2 Gmail accounts with same email address?

Can multiple users use the same email address?

A shared email account is a single shared email address, often something like support@ or help@, that is used by multiple members of a team or company to send and receive email from a central inbox.

Can I have 2 Gmail accounts with same email address?

The short answer is, "Yes, you can have multiple Gmail accounts." Many professionals have both a personal Gmail account and a work Gmail account tethered to their CRM.