Email, Messaging, & Video Calls Email Learn How to Send a Message From a Different Account in Mac OS X Mail Select any of your email addresses for the Mail From field by Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated on January 20, 2020 Burak Karademir / Getty Images Email Yahoo! Mail Gmail Tweet Share Email If you have more than one account–or more than one address per account–in Apple Mail, you can select which you want to use for a message you send. It takes a click or two to switch between email addresses. And if you use one way more than the others, you can set it as the default. Here's how to quickly choose which address to send messages from in Apple Mail. How to Send a Message From a Different Account in Apple Mail Mail stores one email account as the default. This address is the one that appears automatically every time you create a new email message. To change the account or address used for sending a message in the Mail application in Mac OS X or macOS: Create a new message in Mail by clicking the New Message button, selecting New Message under the File menu, or pressing Command+N on your keyboard. Click on the From drop-down menu right below the Subject field of the email. Select the desired email account from the list. Keep writing your email. When you click Send, it will go from the email you selected. How to Change the Default Email Address If you find you are changing to an account more often than you are using the default, make the most frequently used address the default instead. To change the default address for use in the From field: Click Mail > Preferences from the Mail application menu bar. The keyboard shortcut is Command+, (comma). Select the Composing tab. Next to Send new messages from, select the email address you want to use as the new default. You can also select Automatically select best account to have the Mail application choose the best account based on the mailbox you are using. For example, if you are replying to an email from your Gmail inbox, the Mac selects a Gmail address for the From field. When you create a new message, Mail will automatically populate the From field with the default address you chose.