It is not possible to add Email Address on the Remittance Slip. There is the Enhancement 68554: Ability to add custom fields to Remittance Slip logged for this issue.
As an alternate solution, users can change value of the Address field on the Remittance Slip form to display the Email Address instead of the Company Address in the Mail section on the Remittance Slip.
This details can be changed by customizing the Remittance Slip Form.
- Navigate to Customization > Forms > Transactions Forms.
- Click Edit on the appropriate Remittance Slip Form.
In case user is customizing a standard Remittance Slip Form, it is recommended to change the Name of the form and check the Form is Preferred checkbox.
- Enter the Email Address in the Address field.
- Click Save.
The Email Address now appears in the Mail section on the Remittance Slip.