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Change User Name in Apple Mail


How to update your email username to your email address if you are using Apple Mail as your email client.


  • In this instruction, username is the name of the user e.g. smith or jame.low or david.joes.
  • Email address is username@domain.com where username can be simth and email will be smith@domain.com.
  • username@domain.com also represent that domain.com is your email domain name e.g. joe@macrocraft.com so domain.com is macrocraft.com.


  1. Open Apple Mail and select Mail > Preferences....

  2. Select the Accounts you want to perform the update.

  3. Select Account Information Tab. Change your User Name to your email address.

  4. Still in 'Account Information' Tab, under 'Outgoing Mail Server (SMTP)' field, select mail.domain.com (select smtp with your domain name).

  5. In the selection list choose 'Edit Server List'

  6. In 'Edit Server List', select your smtp with your domain name, select Advanced, and change User Name from username to emai address.

  7. Close Apple Mail Preference windows and Save setting.


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