No. Each Stack Team App account can only have one unique email address attached to it at a time.
Why is this the case?
Email addresses in Stack Team App act as:
Your unique login credential
Your notification contact
Your account identifier
Because of this, the system does not support multiple email addresses being linked to a single account.
What Are My Options?
If you need multiple people to receive communications:
Option 1: Create Separate Accounts
Each person can create their own Stack Team App account using their own email address and join the team.
Option 2: Use a Shared Email Address
You may use a shared email address (e.g., family email) when creating an account, but only one login will exist.
Option 3: Update Your Email Address
If you need to change the email attached to your account:
Go to Settings > Account Settings
Update your email address there
(If you cannot access your account, contact support.)