This is important given that companies rely on email as the means of transmitting customer data, invoices, contracts and other legal papers.
But regular email was not designed to keep messages private. Messages could be exposed, altered or made to appear as if they came from someone else during the trip. Since phishing, impersonation, and data breaches are all increasing, securing business email is a must.
S/MIME (Secure/Multipurpose Internet Mail Extensions) is a mature and established protocol for email security, supported by many popular email services. WaveRiser IT helps businesses adopt it.
What Is S/MIME?
S/MIME is an email security protocol that uses digital certificates to do two things:
- Encrypted emails so only the recipient can read them
- Signs your email, allowing the recipient to verify its source and ensure nothing has been altered while in transit
Sometimes, you may find it as SMIME or S MIME. It’s all the same protocol and has been used in secure business communications for quite some time now.
Confidential information sharing organizations use it extensively. This includes law firms, hospitals, accounting practices, financial institutions, government contractors, etc.
How Does S/MIME Work?
At its core, S/MIME is an application of public-key cryptography. Every user is assigned a pair of keys:
- A public key that is distributed to the public and known to other entities.
- A private key, that is kept private and not exposed to others.
These keys are what enable both S/MIME features.
Email Encryption
- In an encrypted email, your email software uses the recipient’s public key to encrypt the message including any attachments.
- The encrypted email/message is sent over the internet.
- The encrypted message can only be decrypted with the recipient’s private key.
In case anyone intercepts the message on the way, all they will get is junk message. That helps keep confidentiality from the second you hit send.
Digital Signatures
- When you sign a message, your e-mail client uses your private key to generates a unique digital signature for the message.
- It the signature your recipient’s email client, which will then use the public key to verify that signature.
- With this feature in use, the recipient can be sure of two things: that you are the one who sent the message and that it has not been tampered with in the interim. In conjunction with digital signatures, encryption is what affords privacy and authenticity while also guarding against any alteration of the message. S/MIME’s protections render it a secure choice for email.
Key Benefits of S/MIME
Email Privacy Improvements
Only authorized recipients can decrypt the emails as well as any attachments included in the communication.
Data Message Integrity
When a digital signature is applied to an electronic document, any alterations made to the data after it was sent will be detected by the verification process.
Identification of Senders
The signing of the email allows confirming that the email message is indeed from a specific person since there is no way to forge the message and apply the signature of your certificate to it.
Minimizing Phishing Threats
Even if S/MIME doesn’t eliminate all phishing threats, it certainly provides reliable means for verifying the sender’s identification and reducing the possibility of being involved in various email frauds.
Support for Compliance
There are a number of industries that have to ensure the protection of their clients’ information and communication. S/MIME is one such security technology that can help achieve compliance. Different sectors may have different compliance needs; hence, you should always check on what your company needs.
Higher Customer Trust
The customers prefer working with those companies that ensure privacy. Signed emails can be a good indicator for this purpose.
Why S/MIME Matters for Growing Businesses
E-mail is a popular target for cyberattacks, and business e-mails frequently include sensitive business information. One message that’s intercepted or falsely sent in your name could result in:
- Fraudulent payment requests and financial losses
- Exposure of customer or staff information
- Legal challenges or regulatory fines
- Long-term harm to your business’s reputation
There is a certain power to the email protection S/MIME provides. It keeps private information safe and staves off expensive data breaches, all while putting customers, partners and regulators at ease by showing your commitment to their security.
How to Set Up S/MIME
Setting up is usually less difficult than businesses realize.
- First, download a digital certificate.
Get an S/MIME certificate from a dependable Certificate Authority (CA). Certificates are generally issued per email address and some CAs provide enterprise solutions for handling a large number of users at a time. - Install it in your e-mail client.
Microsoft Outlook, Apple Mail, and a number of popular e-mail clients and S/MIME are directly compatible. Import the cert aswell as enable it to sign/encrypt on your account. - Share public keys.
You need the recipient’s public key in order to email them that you encrypted. An easy way to get it: they send you a digitally signed mail (their signature contains the public key). Your email client can then save it automatically. - Create clear internal policies.
Decide on emails that should be signed, encrypted and select the email certificate manager(s) for your organization. Your staff should be trained on the appropriate and necessary use of S/MIME. - Consider certificate management.
There are times when certificates must be let to run their course or even revoked outright, for instance in the event of an employee’s departure or a stolen machine.
Don’t know how to start? Leave everything to us at WaveRiser IT. We’ll take care of all tasks such as certificates installation, email client configuration, policies installation and employee training.
S/MIME Best Practices
- Sign all outgoing business email, and encrypt anything that contains sensitive data.
- Back up your private keys securely. In the case of the key loss, you may lose access to your encrypted mail.
- Renew certificates before their expiry to maintain uninterrupted service.
- Revoke the certificate if the device is compromised or the employee leaves
- Secure your private key with a password, or even better, in hardware.
- Educate your staff so that secure email is second nature.
Common Myths About S/MIME
“Only big companies need S/MIME.”
Small and mid-sized businesses are often the target, and are just as likely to handle sensitive client and financial data as larger companies.
“S/MIME is too hard to use.”
While setup requires some attention, once it’s set up, signing and encrypting is usually a single click, or even fully automatic.
“You have to encrypt every email.”
You choose which messages to encrypt. Many companies sign everything and encrypt only sensitive emails, which is more practical for daily use.
“Encryption makes email unreadable on my phone.”
Modern mobile mail apps, including those on iOS and Android, support S/MIME once you have installed your certificate.
certificate is installed.
FAQs
How are S/MIME and TLS different?
TLS helps secure email transmission from one mail server to the other, but email on these servers can be read. S/MIME encrypts the message itself from the sender to the recipient and remains encrypted when saved.
Can I use S/MIME with Microsoft 365 or Google Workspace?
Yes. However, both support S/MIME, but the steps for configurations and availability of features might depend on your plan and administration.
What if the recipient does not have S/MIME?
Signed emails are also generally readable, but the signature will not verify. Of course, you will require a certificate for the signing and encryption of an email; the recipient will need one as well in order to decrypt it.
What if my certificate expires?
You won’t be able to sign or encrypt anymore until you renew it. Retain your existing certificate and key so that you are still able to open previously decrypted emails.
Final Thoughts
With cyber threats on the upturn and the demand for robust data protection growing, one could say that secure email like S/MIME is now an absolute necessity.
They are designed to keep your emails private, your identity verifiable, and your business more prepared to meet its security and compliance needs. WaveRiser IT specializes in assisting businesses in Dubai in deploying S/MIME and other secure communication tools, from certificate installation to ongoing support.
Contact us to secure your email and establish the trust that your customers expect.
