No, if you are sending the same email with BCC recipients then they will not be able to see and check the email address of each other. So you can add BCC to Outlook if you want to hide email addresses from recipients.

Steps about how to change default font in Outlook : Open and log in to Outlook’s web version Click the Settings icon Then, go to Mail >> Compose and reply Scroll down a bit, and under the ‘Message format,’ click the drop-down button for fonts Now, choose the font of your choice and click ‘Save’

There are a lot of reasons why a user needs to change the default Outlook browser such as user preference, compatibility issues, office policies, browser performance, extension or add-on issues, etc.