I have 4 Gmail accounts in Mac Mail on Macbook Pro running Yosemite. Mail sent from one account displays it's from another of my accounts when it reaches the recipient. The recipient then replies to the wrong account. If sent using the webmail gmail account the address displayed to the recipient is correct. Is this a known bug in Mac Mail or is there a setting I've overlooked? I would like to keep all my accounts together so I hope someone can suggest a solution. thanks