> For the complete documentation index, see [llms.txt](https://docs.emaillabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emaillabs.io/en/email/email-api/settings/smtp-accounts/s-mime.md).

# S/MIME

S/MIME (Secure/Multipurpose Internet Mail Extensions) is a cryptographic standard used for encrypting and signing email messages, ensuring both the security of the content and verification of the sender’s authenticity. With S/MIME, messages are protected from unauthorized access, and recipients can be assured that they originate from the correct sender.

To use S/MIME, you need to purchase a digital certificate and provide it to us for configuration. This certificate will enable message encryption and the addition of a digital signature, significantly enhancing the security of email communication.

For details regarding the cost of implementing an S/MIME certificate, please contact our Customer Support team at <support@emaillabs.io>.

<figure><img src="https://1834454488-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxRBDHL4zFAAFTf3m7JIr%2Fuploads%2F1OrqQFIkX2CxrJPLaFys%2FZaso%CC%81b%20118%402x.png?alt=media&amp;token=36e5c680-b80f-4192-85d1-d857e61fa813" alt=""><figcaption></figcaption></figure>