How to Send Mail From a Different Email Address in Mac Mail
When you compose a new outgoing message in Mac Mail, the application sends the message through the account corresponding with the last inbox that you viewed. However, you may have configured several email accounts in Mac Mail with the intention of using only one for outgoing messages. If this is the case, use the "Preferences" menu in Mail to define a default account for outgoing messages. If you need to switch to a different account to send a single message, you can still do so from the message composition window.
Instructions
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1
Launch Mail from the Dock or Applications folder. Click the "Mail" menu at the top of the window, and then click "Preferences."
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Click the "Composing" tab at the top of the window.
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3
Click the "Send New Mail From" drop-down menu and select the account that you would like to use for outgoing messages.
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Close the Preferences window to return to Mail.
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Tips & Warnings
To change an email account for a single outgoing message, click the "From" drop-down menu under the "Subject" field in the message composition window and select the account that you want to use.