> Bypass spam filters for internal senders
Is this what you are looking for?
The issue here is that developers and IT folk seem to think that email is easy because the know IT. Email is a complex, and old protocol that has many nuances and, believe it or not, phishers are smart; end users are naive, and often reckless. Spammers, be they benign or otherwise, can be incredibly lazy too, but don't think for one second that you, as a postmaster, are cleverer than they are. Spam and phishing are getting harder to beat. Businesses like Proofpoint, Cisco and Mimecast, along with the likes of Google and Microsoft, are investing heavily in trying to beat these guys, but the reality is that they are always at least two steps ahead.
Drives me nuts having to leave a UI to google (ironically) the issue to find a doc to enable a check box.
You would really think that Google would whitelist emails within the same custom domain which is paying for Gsuite service. Maybe that has changed, but it was definitely a problem 5 years ago.
And we're not talking about an email which had some copy/paste of spam, we're talking about a one or two line sentence giving an instruction or asking a question to a colleague.