Final answer:
ProtonMail provides secure email services with end-to-end encryption. Encrypted messages require recipients to use a password provided by the sender to access the email content, distinguishing them from standard emails. Proper email etiquette, considering privacy and content clarity, should be applied regardless of the communication platform used.
Step-by-step explanation:
When using ProtonMail to send a secure email, there are several features that differentiate it from standard emails. ProtonMail employs end-to-end encryption to ensure that only the sender and the recipient can read the contents of the email. If you use the encryption option (symbolized by a padlock) when composing your email, the recipient will receive a message that is different from regular emails. They will not see the actual content directly within the email itself. Instead, they will see a notification that they have received an encrypted message from you, along with a link to ProtonMail's secure reading environment. They must enter the message password you set to decrypt and read the email. This layer of privacy prevents unauthorized access to your email content and makes it stand out from other non-secure emails in your inbox.
When composing emails, it's essential to keep in mind the professional vs. private email perspective. Whether for academic, professional, or personal communications, using correct spelling, proper grammar, and considering the potential audiences and impacts is crucial. Sensitive and confidential information especially should be communicated with caution. ProtonMail's encryption feature is one way to add security to your emails, ensuring that only intended recipients with the password can access the message content.