Email font colour netiquette for readable messages. Use blue or black font for professional electronic messages. Other colours distract from the message and are unprofessional. Do this when sending email about how we earn a living. In the software applications.
Work from anywhere professionals, remote workers, and administrative workers need to make readable messages. So, coworkers take correct actions upon receipt.
First, we look at writing differently if it is not standard. And so, wrong in a sense. Hence, black font for professional email. Good netiquette to use standard text colours. As a result, don’t use fancy fonts or write in red. Given, unprofessional.