Hi @mahmoudayman5. Thanks for being part of GoDaddy Community! If you are using Office 365 email it is possible to enable DKIM if you follow the steps in this Microsoft support article. If you use Workspace Email or cPanel email, it is not possible to set this feature up. I hope that helps.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.