One of our servers which used to send a few notification emails to us via postfix stopped doing so - status=bounced (host gmail-smtp-in.l.google.com[142.251.2.27] said: 550-5.7.26 This mail has been blocked because the sender is unauthenticated. 550-5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.
So, set up an SPF record in cloudflare, and all is well again.
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