Why am I unable to access my email account on a different network?

Verify if You Have Internet Access
Check if you are connected to the Internet through Wi-Fi or mobile data. If not, connect to a network.
Check Email Account Credentials
Make sure that the username and password for the email account is correct.
Check Email Account Settings
Ensure that the account settings are proper and are configured as per the current network.
Check Email Server Status
Make sure that the email server associated with the email account is up and running that the users can connect to their account.