How to setup MailChannels with correct email security headers? Gmail is flagging my emails with warnings

I have a worker that sends an email with MailChannels, exactly as in the first example here:

when emails are received into my test inbox, Gmail flags them with warnings:

Gmail couldn't verify that actually sent this message (and not a spammer)

I did some digging and updated my DNS for that domain with the following SPF record:

v=spf1 ~all

But that didn’t seem to work, and anyway if you setup Cloudflare email routing, it makes you overwrite the SPF for mailchannels:

What’s the solution here? Is there any detailed documentation on how to setup email correctly?

Hello there,
I think you’ve not added DKIM & DMARC record that’ll solve the flagging.

Thank you. Setting up DMARC with the “quarantine” option worked.

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