Secure corporate and personal email communications with industry-standard PKI encryption.
Price range: $9,96 through $37,15
$11,00
$37,00
Two critical capabilities for securing corporate correspondence and eliminating phishing:
Encrypts the email body and all attachments with the recipient's public key. Only the recipient holding the paired private key can decrypt and read it. If a mail server is compromised, your messages remain secure.
Signs outgoing emails with the sender's private key, proving who sent the email and confirming nothing was altered in transit. Recipients verify the signature with the sender's public key, stopping spoofing attacks.
TLS only protects the network connection between mail servers while emails are in transit. Once delivered, emails sit unencrypted on mail servers. S/MIME protects the message itself from outbox to inbox.
Defined under the CA/Browser Forum S/MIME Baseline Requirements (effective September 2023):
Confirms control of the email address with automated email verification. Quick setup, ideal for personal email or solo professionals.
Verifies the certificate holder's real-world identity through government-issued ID. Ideal for freelancers, attorneys, and consultants.
Verifies the organization's legal existence and displays the company name in the certificate. Ideal for departmental and sales inboxes.
Issued by an enterprise to verified employees, confirming both the company and the individual representative. Standard for enterprise fleets.
Critical compliance and security protection for regulated organizations:
Healthcare organizations handling protected health information (PHI) need email encryption to meet HIPAA compliance mandates. S/MIME applied to clinician and administrative accounts satisfies regulatory requirements.
Law firms and financial institutions face strict confidentiality rules and growing exposure to wire fraud. A digitally signed email confirms authenticity. FDA-regulated businesses can use DigiCert certificates for ESG compliance.
Common questions about this certificate type, validation standards, and deployment.
TLS encrypts the connection between mail servers during transmission. S/MIME protects the email content itself, regardless of how many servers it passes through or where it is stored. TLS protects transit; S/MIME keeps messages encrypted at rest.
For encryption, yes: both parties need certificates so they can exchange public keys. For digital signing alone, only the sender needs one. Sending a signed email automatically shares your public key with the recipient so they can reply with an encrypted email.
Most major clients support S/MIME natively: Microsoft Outlook, Apple Mail (macOS and iOS), Mozilla Thunderbird, and Google Workspace Gmail enterprise accounts.
S/MIME certificates on Renewal SSL are valid for up to 2 years. Under the CA/Browser Forum S/MIME Baseline Requirements, Strict and Multipurpose certificate profiles have a maximum validity of 825 days.
Free certificates are limited to mailbox validation, include no vendor support, and cannot display your verified organization identity. Paid certificates from Sectigo and DigiCert add full organization validation, document signing capabilities, and dedicated support.
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