You may update the From email address from Configuration > SMTP Settings:
Or update this directly in your SQL database by following the steps below:
1. Log into the SQL server hosting the Active Administrator database.
2. Launch SQL Server Management Studio.
3. Expand the Active Administrator database | Tables.
4. Highlight the dbo.tblConfig table right click and Select Edit top 200 rows.
5. Find the FromAddress record and edit the email address to the required address.
6. Click on any other row in the table.
7. Close out of the dbo.tblConfig table.
8. Log out of SQL Server Management Studio.
9. Refresh the SMTP settings in the Active Administrator Console | Configuration Module | SMTP Settings.