I've had emails from family members go straight to gmail's spam folder on two different occasions, and a third occasion in which the mail appeared to have sent

I've had emails from family members go straight to gmail's spam folder on two different occasions, and a third occasion in which the mail appeared to have sent according to the sender's mailserver, but never showed up anywhere in my gmail account. From what I could tell glancing around some forum posts, mine was hardly a unique experience and is reliably solved (well, in the first two cases) only by explicitly whitelisting every single address from which you expect to receive correspondence. I'm glad to see more attention to this issue of overzealous filtering.