As to the spam filters, on the other hand in Gmail I'm getting more and more proper ("ham") mail landing in the spam folder recently... thus I have to tread the

As to the spam filters, on the other hand in Gmail I'm getting more and more proper ("ham") mail landing in the spam folder recently... thus I have to tread the spam bin ~weekly to make sure nothing important/interesting is lost... particularly, it seems to like having certain persons on a blacklist (probably based on some misconfiguration at their email provider?), regardless of the fact that I always patiently go through them and mark as "Not spam". (Notwithstanding that I had them trigger a "send to gmail team for spam filter tweaking" dialog countless times, obviously selecting "yes" always.)