Setup Gmail, Hotmail and Yahoo! in Mac Mail Sort your email with Smart Mailboxes and Coloured Flags Fix problems with autocomplete and using the Connection Doctor Change the default account, signature and using BCC recipients Apple Mail is the default Mail app that comes with Mac OS X. Because it’s included with new Macs, it’s the one that Apple users use the most, and although alternatives are out there: Mac Mail is one of the best email programs you can use. There are a range of Mac Mail tips that