There is a choice of solutions for that, paid and free, and indeed all of these happen outside of github. On the free side here are a few free services: postale.io Zoho Mail free plan Yandex Zoho Mail free plan limits you to their webmail only, and Yandex has ads. postale.io doesn't have those limitations. The DNS setup is also taken care of for you, if requested (still for free). Hope this helps!
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