[slacka]

> - 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.

[matrixagent]

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.

[gaadd33]

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?