PagoPago is a simple utility application that sends out remittance advices to payees, when they are paid in Microsoft Dynamics GP.
It requires an SMTP account. It does not use MAPI and therefore overcomes the issue with emailing remittance advices from GP

Although PagoPago is free to use, registration is required. user name, company name, email address and phone number are needed. You will receive an email confirming your registration