Sending email via mailchannels on a preview domain

I'd like to send emails via mailchannels on my project's preview url (e.g. foo.pages.dev), to use my site's auth flow. Is this possible?

I'm asking because usually Mailchannels requires TXT requires on the domain, which I can't set up on a preview domain. Or is it possible to use an API key with mailchannels instead?
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