From your question, it seems that you enabled Person Account in your organization. If that's the case, then you will have to check the IsPersonAccount field rather then checking the Email field.

So your workflow's rule criteria should be IsPersonAccount equal to true and not Email not equal to null

As your current rule criteria is Email not equal to null, which will always be false, hence your workflow is not firing.

Change your workflow to

Workflow rule = Account: IsPersonAccount equal to true

Immediate Action: field update: new email field equals formula: PersonEmail

You can find further help on this link.

From your question, it seems that you enabled Person Account in your organization. If that's the case, then you will have to check the IsPersonAccount field rather then checking the Email field.

So your workflow's rule criteria should be IsPersonAccount equal to true and not Email not equal to null

As your current rule criteria is Email not equal to null, which will always be false, hence your workflow is not firing.

Change your workflow to

Workflow rule = Account: IsPersonAccount equal to true

Immediate Action: field update: new email field equals formula: PersonEmail

You can find further help on this Salesforce knowledge article.

From your question, it seems that you enabled Person Account in your organization. If that's the case, then you will have to check the PersonEmail field rather then checking the Email field.

So your workflow's rule criteria should be PersonEmail not equal to null and not Email not equal to null

As your current rule criteria is Email not equal to null, which will always be false, hence your workflow is not firing.

Change your workflow to

Workflow rule = Account: PersonEmail not equal to null

Immediate Action: field update: new email field equals formula: PersonEmail

From your question, it seems that you enabled Person Account in your organization. If that's the case, then you will have to check the IsPersonAccount field rather then checking the Email field.

So your workflow's rule criteria should be IsPersonAccount equal to true and not Email not equal to null

As your current rule criteria is Email not equal to null, which will always be false, hence your workflow is not firing.

Change your workflow to

Workflow rule = Account: IsPersonAccount equal to true

Immediate Action: field update: new email field equals formula: PersonEmail

You can find further help on this link.