To send secure email in Outlook with focus on the subject line, you can include special keywords like "Secure:" or "[SECURE]" in the subject line to trigger encryption depending on your email system configuration. Microsoft Outlook supports secure emails through encryption methods such as S/MIME, Microsoft Purview Message Encryption (OME), or secure email add-ins. Here are key points for sending secure email in Outlook related to the subject line:
- Adding "Secure:" anywhere in the subject line (with the colon) routes the email through a secure email server for encryption where supported, though the subject line itself is not encrypted.
- Using "[SECURE]" (including brackets) anywhere in the subject line instructs certain organizational encryption systems to encrypt the message and any attachments. This is case-insensitive and effective across various Outlook versions.
- In more advanced setups, Outlook lets you manually encrypt emails by selecting Options > Encrypt when composing an email, which protects the message content but not necessarily the subject line.
- Adding these tags in the subject line ensures the recipients are prompted to authenticate or use one-time passcodes to open the secure content, keeping the email body and attachments protected, while the subject line remains visible.
In summary: To send secure email via Outlook with security indicated in the subject line, put "Secure:" or "[SECURE]" anywhere in that line when composing your message. This action triggers encryption protocols in compatible systems, although the subject line itself remains unencrypted. For full encryption including message content, use Outlook's Encrypt option additionally. If needed, guidance on setup or certificates for S/MIME encryption can be followed for more robust secure email sending. This approach ensures compliance with common organizational secure email policies and protects sensitive email content effectively while making the subject line visibly marked as secure for receivers.
