ORA-20004:ERROR IN SENDING AN EMAIL IN APEX

ORA-20004: Error in sending an Email – You have exceeded the maximum number of email messages per workspace. Please contact your administrator.

REASON:

Actually, Number of mails can be sent per 24 hour for the workspace, It may exceeded.

SOLUTION: 

Login as ADMIN and Go to –>Manage Instance–>Instance Settings–> Mail–>Maximum Emails per workspace

STEP 1:

LOGIN AS ADMIN

STEP 2:

SELECT ADMIN > MANAGE INSTANCE

STEP 3:

SELECT ADMIN > MANAGE INSTANCE > INSANCE SETTING

STEP 4: 

IN THE COLUMN SELECT EMAIL TO CHANGE

STEP 5:

CHANGE THE MAXIMUM MAILS PER WORKSPACE.