Hello, I need a free email client that works on Mac OS Sierra that has the following. Able to link to my gmail account and sync google groups automatically so that I can make an email messages out to saved contacts in the cloud, google contacts, able to have a relatively fast check mail every five minutes or so. Able to sync google calendar to write and read new messages to my google account. Multiple email inboxes so I could align the program to filter messages that put in different lists. Any suggestions?