I have two google mail addresses. I've set them both up to be retrieved by Apple mail on my Mac. About a week ago, my main gmail account quit synching with apple mail. I still get the incoming mail from my secondary account and they are both set up identically on my Mac, so far as I can tell. I receive mail from both gmail accounts on my iPhone and iPad. What's going on with my Mac? I am running El Capitan. My Mac is a 2009 model with 4 Gig of RAM.