Hello

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?

Thanks.
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