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

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If you have more than one account or more than one address per account in Mac OS X Mail or macOS Mail, you can select which address you want to use for a message you send. This changes the address used in the From email header.

Send a Message From a Different Account in Mac OS X Mail or macOS Mail

In the Mail settings, a default email address is set. It is this address that appears most often in the From field of the email. To change the account or address used for sending a message in the Mail application in Mac OS X  or macOS:

  • Click on the From drop-down menu right below the Subject field of the email.
  • Select the desired email account from the list.

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.

How to Change the Default Email Address

To change the default address for use in the From field:

  1. Click Mail > Preferences from the Mail application menu bar.
  2. Select the Composing tab.
  3. 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.