All your contacts are added to the label 'My Contacts' by default. So, Click + icon on top left to draft new message. Click on To to select contacts In popup window My Contacts will be selected. Click on Select All. Now close it by clicking Select button below. Now all your contacts will be in the address box. PS: While emailing all contacts it is better to use Bcc rather than in To field. Marking addresses in To field will expose it to all the recipients. Hence use Bcc(Blind Carbon Copy)
