On email providers github page I found
Please note that in any email provider, you must verify and use the subdomain, e.g. discourse.example.com . If you verify the domain only, e.g. example.com , mail will not be configured correctly.
It is not quite clear. Should I obey this rule if my discourse works on example.com, not on discourse.example.com?
You are correct, if you have installed at the apex domain (which I do not recommend) then you should validate email at the apex domain.
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