I've moved my web site hosting from godaddy to heroku. In DNS, I know I need a CNAME record for myapp.herokuapp.com; but what do I do with the A record? Seems like I need that for smtp, as the smtp records use @?
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You can't have concurrent CNAME and A records for the same name.
Mail is handled by the MX entry on the root domain, that's unaffected.
If you have subdomains currently CNAME'd to @, just CNAME them to a new name, which then points to the original IP.
This may also be of interest: https://stackoverflow.com/questions/16022324/how-to-setup-dns-for-an-apex-domain-no-www-pointing-to-a-heroku-app
