Advantages of Using Secure Mail
No doubt that a secure message sent using your email address is better than sending email without digital and encryption. It is because the recipient of the message will confirm or verify that the message received is from you. Sending an email without a secure email certificate is like sending a postcard, where the delivery man can read the message in a postcard before it reaches your mailbox. The postcard message can be erased or modified since it is open already.
Like a postcard, an email message without a digital signature and encryption can be intercepted, spoofed, and altered:
Intercepted and altered email message: There are numerous reports already that an email message can be intercepted during transit, especially if you use a public and unsecure Internet connection. Encrypting and digitally signing a message will prevent an unauthorized user or hacker to read or modify a secure message.
Spoofed email: If you frequent discussion forums or you are aware of the email threats reported in many technology sites, you will notice many business and end-users have become victims of spoofed messages. In some cases, malware is the cause of spoofed email but there are incidents that the spoofed email message or email address is due to hacked e-mail accounts or email servers. Using a digital signature for emails and protection by an antivirus should help prevent this scenario.
Running a business means you have important contacts to communicate with. They can be a business partner, affiliates, or customers. Sending a secure email message to important people and even potential customers provides confidence and trust in your company because the message they have received is secure using a digital certificate or encryption. It helps to verify that the information in a message came from you or your company, and not from an impostor.
The example is an email being sent by Microsoft to subscribers of Microsoft products' Security Bulletins and revisions:
Microsoft has digitally signed the e-mail newsletter using PGP Desktop. This is to ensure recipients that the email message is not a fraudulent message but is from Microsoft. Microsoft has published also its PGP key and S/MIME certificate at https://www.microsoft.com/technet/security/bulletin/pgp.mspx.