“Fast, high-quality service, and a support team that was clear throughout the email security consultation.”
Hằng Mỹ A program supporting startups with Cloud and AI Factory services at HITECHCLOUD
The HiTechCloud brand
S/MIME solution
Email security through sender authentication, digital signatures and content encryption. Automating email security reduces exposure to attackers, fraud and spoofing.
369,000 VND/ year / email
Email digital signatureContent encryptionSender authenticationOutlookGoogle Workspace
Digitally signed and encrypted emailProtect sensitive information in every email you send to customers, partners and colleagues.
What is S/MIME
The certificate is attached to each email, not to the server.
S/MIME (Secure/Multipurpose Internet Mail Extensions) is the standard for email signing and encryption defined in RFC 8551. The certificate is issued to a specific email address and installed in the user's email client, so the signature travels with each message rather than sitting at the server layer.
Recipients see the authentication mark directly in Outlook, Apple Mail or Thunderbird: the message really was sent from that address and its content was not altered in transit. With encryption enabled, only a recipient holding the key can read the content.
- Technical standards
- S/MIME v4.0 — RFC 8551, X.509 certificates
- Coverage
- Per email, tied to a specific address
- Two functions
- Digital signing to authenticate the sender and encrypt the content
- Supported email clients
- Outlook, Apple Mail, Thunderbird, iOS Mail
- How it differs from SPF/DKIM/DMARC
- The other three standards authenticate the domain at server level; S/MIME authenticates each sender
Trusted worldwide
S/MIME is an email security standard used widely around the world.
HiTechCloud helps businesses adopt S/MIME to protect critical email, financial transactions, contracts and internal correspondence.
Customer reviews
Businesses rely on the S/MIME solution to protect their email.
The responses are summarized here, focusing on the support experience, service quality, and deployment outcomes.
Hằng Mỹ“Proactive, attentive support, with each deployment step explained clearly so we could adopt the service with confidence.”
Khuyên Phạm“Good service quality, professional support, and a very satisfying overall experience.”
Tân Nguyễn“Fast advice, information matched to our needs, and solid help implementing email security.”
ASIA LAB
Pricing
Choose the service plan that fits you.
Deploy per mailbox rather than across the whole system. Prices exclude VAT.
The difference
The difference with and without S/MIME.
S/MIME is not only about security — it also helps you work more effectively with important email.
No S/MIME
S/MIME included
Recipients have no easy way to tell whether the email really came from you.
Email is digitally signed so recipients can clearly verify the sender's identity.
Important email content can be intercepted or tampered with in transit.
Content can be encrypted so only the intended recipient can read it.
Transactional email is easy to spoof, which undermines customer trust.
Reduces the risk of fraud and impersonation and makes every email more professional.
Features
Not only security — it also helps you work more effectively.
Sender authentication, instant trust
Recipients know the email really came from you. No more doubt when handling important information.
Email encryption, readable only by the recipient
Content is better protected. Only the intended recipient can decrypt and read the information.
Increase reliability with every email sent
Authenticated email makes both you and your company look more professional.
Prevent email spoofing
Prevents bad actors from exploiting your business email for fraud or reputational damage.
Increase open and response rates
Authenticated email gives customers and partners more confidence in the information they receive.
Verification displayed in email
Clear identity from first contact, particularly for transactional email and contracts.
Suitable for individuals and businesses alike
From freelancers to companies, anyone can protect email and important data on a per-user basis.
FAQ
What to know before deploying S/MIME.
How does S/MIME differ from sending ordinary email?
An ordinary email is like a postcard: its contents can be read or forged in transit. S/MIME adds a digital signature and encryption so the recipient can verify the sender, while giving the email's contents stronger protection.
Can I use S/MIME on a mobile phone, in Outlook or in Gmail?
Yes. S/MIME is supported by common email clients such as Outlook and Apple Mail, and in Google Workspace and Microsoft 365 environments when configured correctly.
Why does a business need S/MIME when it already has a firewall and spam filtering?
Firewalls and spam filters protect at the system layer, while S/MIME protects each individual email through sender authentication and content encryption. The two security layers complement each other.
If I send a digitally signed email to someone without an S/MIME certificate, can they still read it?
Recipients can still read digitally signed email. Encrypted email requires the recipient to hold a matching certificate or key to decrypt the content.
HiTechCloud S/MIME
Start protecting your email today.
Do not let email become your security weak point. HiTechCloud will recommend the right package, guide configuration and support per-user rollout.
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