How do you address a female doctor on mailing envelope?

There are several ways to address a female doctor on a mailing envelope. Here are a few options:

1. Dr. [Last Name]

2. [First Name] [Last Name], MD

3. Dr. [First Name] [Last Name]

4. [First Name] [Last Name], MD, [Specialty]

5. [First Name] [Last Name], DO

6. [First Name] [Last Name], DO, [Specialty]

The appropriate format may vary depending on the doctor's preferences, so it's always best to check with the individual if you are unsure.