Precautions while using Securing Email
Enter a subject in the subject bar
Keep your subject line short and make sure that it appropriately summarizes the contents of the email you are sending. Subject lines that use all upper case letters, misuse numbers, or include too many symbols may look like spam emails to your recipients and therefore they may not want to open them. You do not have to put a subject in order to send an email. Leave the subject line blank if you prefer not to add one.