1. Open Mailbird and click on the 3 bars in the top left corner.

  2. That will open up a few options, click on Settings

  3. In your settings, click on Identities and that will open a list of email addresses which you use within Mailbird

  4. Select the email address you want to amend, and click Edit

  5. You will then see the Outgoing Server Settings

  6. Here you can change the port number to 587

  7. In the Encryption box, select STARTTLS and click OK.