Hi @Rahul_Jain. A big part of the answer to your question would depend on what kind of bounceback is being generated. This article should help you get pointed in the right direction. If you believe that emails are being rejected incorrectly, you may want to contact our support team to have the issue reviewed. Usually, that will require you to have a copy of the original message that caused the bounceback as well as the bounceback itself. Hope you're able to figure this out.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.