Very long time back we had published few articles about custom domain email services with Google Apps Standard and Outlook.com on a Custom Domain , nowadays most of the major services are not offering free. Zoho is offering a free service with 25 email users and 5GB per user storage, I suggest you Zoho Mail Service is the best way to setup your custom domain email service. Have a look at this post and follow each and every step to signup Zoho Mail Service.
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