https://getmemex.com/ might be what you're looking for. I've tried to use it, but it somehow managed to destroy its database 3 or 4 times. After that I gave up and uninstalled the extension again.
I'd like to point to another smtp server, which I am using and is much easier to set up than postfix in my opinion, especially for small servers like mine: https://www.opensmtpd.org/
I'm running a personal mailserver (opensmptd, dovecot, dkim, spf, dmarc, spamassassin) for some years now and although I initially had problems with deliverability to google there aren't any (apparent) issues so far.
Also I don't understand why people keep emphasizing google's spam filter being so much better than anything else. For my personal server SpamAssassin has proved itself to be more than sufficient, its spam filtering performance is on par with Gmail's (I have a Gmail account aswell), at least for me.
Of course, Gmails spam filter works better for the billions of accounts they manage, but in order to handle the spam of a tiny mail server I'm probably not the only person who is satisfied with SpamAssassin.
The login form usually sends the password in cleartext and it's then hashed on the server-side prior to comparing it to the hash stored in the database.
So they can just determine the password's strength at the time when the user is logging in
> The Planck time is by many physicists considered to be the shortest possible measurable time interval; however, this is still a matter of debate. [0]
So, if this is true, then does it mean that time does not 'flow', but rather 'chunks'?
> Combined low concentrations of copper (5 μg/l and chlorine (50,μg/l have been effective in preventing both micro and macro-fouling in over 120 seawater installations since 1987.
Not the OP, but I have a similar setup, however instead of Postfix I am using OpenSMTPd, which I found much easier to configure.
Checking for false positives is a manual process. I've never had legitimate mail marked as spam though, only the other way round.
My experience with Gmail's filter is not as nice btw. At work, I had a couple of situations where important mails from a customer were flagged as Spam, which went unnoticed for two weeks.