Scenario: When a sales order is been created a mail for the is send to the customer. User needs to sending the mail to the customer.
Solution:
Need to check and rectify the scenario/option to send default mail to the customer.
Go to Customization> Forms> Entry Forms. The “Checked” option for “To Be E-mailed” field for the custom form (Custom Transaction Form> Screen Fields> Communication: Messages) needs to be unchecked.
Lists> Relationships> Customers. Unchecking the “Send Transaction Via Email” checkbox under the preference subtab of customer record.
Note: The Save and Email option will also send the mail to the customers.