Hello, AFAIK you can't use the "doma.in" DKIM Key for signing "sub.doma.in" eMails. You need to add a separate key in the DNS file - which in this case you can't.
my current domain (bitfox.ddns.net) can set neither txt records nor cname records. So I can't setup dkim/spf for this domain. So, by default I can't send email to gmail etc which requires either spf or dkim. but when I send email with this domain through fastmail's server, fastmail will add dkim via their domain (messagingengine.com) and this message can pass through gmail's check. i am just not clear, can dkim be applied to not only the sender domain but also any other domains?
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