Create Mobile Login Page

• Click the gear icon in the top right of the screen, then click Setup.

• In the Setup menu, select Lightning App Builder.

• Click New.

• On the next screen, select App Page.

• Click Next.
• Use 'Login Page' for Label.

• Click Next.
• On the next screen, select Once Column.

• Click Finish.

Next we need to add a new Visualforce to our new Lightning App.

• Drag Visualforce to the open area on the page.

• Click Save in the top right corner.
• When promted, click Activate.

• Leave activation options default and click Save.
• When promted, click Finish.
• Click Back.

Activate Mobile Login Page

Now that we've created our Login Page, we need to add it to our mobile layout.

• In the Setup menu, select Salesforce Navigation.

• Select Login Page and click the right arrow icon to add it to the 'Selected' menu.

• Click Save.

Done! You have successfully configured mobile email sends