A suggestion that may help some folks: switch to digests. Not a solution if you like the interaction of receiving and sending emails all day, but for folks, like me, who spend an hour on groups in the morning and then leave them be for the rest of the day, digests reduce the volume of email and the odds that it will be classed as spam. When they are classed as spam, it's only one email to report not spam.
Best, Marv
Marvin Waschke