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> - define, hardcode and publish rules that will lead to successfull e-mail delivery (SPF, DKIM, history,...)

This has existed for years:

https://toolbox.googleapps.com/apps/checkmx/check?domain=tab...

If your site passes and is not on a blacklist, your email gets delivered.

This is not doing what you think it does. And it's the second comment where you are spreading your misinformation I've seen in this thread now. :( This tool is for people who want to send their emails via GSuite and their own domain. Not a lot of people in this thread want that, and it certainly has nothing to do at all with what is being discussed in the comment threads where you replied to.

That says you must permit google to send email on your behalf in your SPF record. How is that relevant at all for sending email to Google?

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