content: If you are unable to access proton mail at work:  Link proton account in gmail. Use as an Alias. Do not forward mail to Gmail. You can now send mail from your proton account in gmail. Reply to coworkers from your proton mail alias within Gmail. They will reply to the email address you most recently used. Your new reply emails from coworkers will be at Proton mail. If you are able to access Proton mail at work:  Forward your Gmail to proton mail. Reply to emails from your proton account. Slowly people will adopt the new email. New emails sent to your proton will not be sent through Gmail and you will still receive messages sent to your Gmail. Update your LinkedIn and other public facing displays of you email with your new account.  Update your HR or Tech people on your new address.