Best Email Client

[openskies2009]

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?

 

[BrianBaughn]

Please explain "Able to sync google calendar to write and read new messages to my google account."

 

[openskies2009]

Display a calendar in the client that is able to sync my google calendar, when I write a event on my computer it syncs up to my google account

 

[BrianBaughn]

An all-in-one Email, Contacts and Calendars app that syncs all of those with Google including Google contact groups...doesn't exist unless something new came out this week.