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Anti-spam protection for businessBusiness e-mail without spam, viruses and phishing

Čistý mail filters your mail on our servers before it reaches your mailbox. Nothing to install, a clear web admin and 24/7 support.

Try free for 30 days How it works
  • Nothing to install
  • Maximum availability
  • Servers and data in the EU
  • 24/7 support
Čistý mail anti-spam – web administration with an overview of caught spam and anti-spam protection settings

What the Čistý mail anti-spam does

Modern filtering that learns from your mail flow, with settings fully in your hands.

Anti-spam and anti-phishing

Modern anti-spam filters, Bayesian analysis, RBL, SURBL and SPF, DKIM and DMARC checks stop spam and fraudulent e‑mails – effective phishing protection.

Virus protection

An e‑mail anti-virus with an up-to-date database scans every attachment and blocks dangerous file types.

Backup during outages

When your mail server is down, mail is kept with us and delivered once it is back.

Settings in your hands

In the web admin you choose whether to tag or redirect messages and manage your blacklist and whitelist.

Statistics and logs

Real-time overview of every message, charts and regular summaries by e-mail.

Encryption and high availability

TLS encrypted communication, HA cluster and a geographically separate backup.

Clear web administration

Everything important in one place – nothing to install, right in your browser.

  • Statistics and charts – received messages, caught spam, viruses and blocked connections per day, week, month and year.
  • Top attackers and targets – where spam comes from and which addresses are attacked most.
  • Details of every message – why it was caught, its score and the delivery status for each recipient; add the sender to the whitelist or blacklist with one click.
  • Quarantine and logs – deliver a message caught as spam to the recipient even up to 90 days later, search the logs and export them to Excel or CSV.
  • Secure sign-in with MFA – two-factor authentication with a code from an app (Google or Microsoft Authenticator) and a history of sign-ins and settings changes.
  • Settings for each domain – spam thresholds (even for individual addresses), quarantine, blacklist, whitelist and e‑mail summaries.
Administration screen: main settings with thresholds for clean mail, possible spam and spam

Spam thresholds and quarantine

Set the score at which a message is only marked and when it goes to quarantine. Each domain – and even each address – can have its own rule.

Administration screen: choice of RBL, SPF and greylisting checks

Checks before accepting a message

Choose which checks run during the SMTP connection – RBL lists, SPF and greylisting.

Administration screen: settings of e‑mail summaries of blocked messages

E‑mail summaries

An overview of blocked messages every 3 hours, daily or weekly – for the whole domain or for individual recipients.

Up and running in minutes

Nothing to install. You only change where mail for your domain is delivered.

  1. Fill in the form

    We activate your domain for a free, no-obligation 30-day trial.

  2. Change MX records

    Mail for your domain then flows through our servers.

  3. Receive only clean mail

    Spam, viruses and fraud stay with us, only legitimate mail reaches your mailbox.

How it works in detail →

For your own server and for the cloud

Čistý mail protects your mail wherever your mailboxes are. You decide where your mail is stored.

Your mail in your own hands

Want to keep your e-mail on your own server rather than in someone else's cloud? Čistý mail protects your mail server in your office or data centre. Messages only pass through our filter and are stored temporarily only when your server is unavailable.

Microsoft 365 and other cloud services

Are your mailboxes in Microsoft 365 or another cloud service? Čistý mail works as an extra layer of protection in front of them – just change the MX records and allow delivery from our servers in the destination service. We will help with the setup.

Why a dedicated anti-spam service

Spam is no longer just annoying advertising. Unwanted mail hides phishing e‑mails, fake invoices with changed bank details and attachments with viruses. A good anti-spam service with phishing and virus protection is as important for a business as anti-virus on its computers.

Čistý mail works as an anti-spam filter in front of your mail server – whether you run your own server or Microsoft 365. Mail first passes through our servers, where it is checked by modern anti-spam filters, Bayesian analysis, RBL and SURBL lists, SPF, DKIM and DMARC checks and anti-virus. Only what belongs there reaches the mailboxes.

Unlike the filter at your mailbox provider, the spam protection is fully in your hands: set thresholds, quarantine, whitelist and blacklist, find any message in the log and receive e‑mail summaries of caught spam. Servers and data are in the EU and our support team helps with the setup. How the Čistý mail anti-spam works →

Trusted by

Čistý mail protects many companies and organisations:

  • Mane holding, a.s.
  • Sinop CB, a.s.
  • Sinop SMP a.s.
  • Abacus Electric, s.r.o.
  • VHS CB s.r.o.
  • Makatherm CZ s.r.o.
  • DFK Group a.s.
  • Český mlynář, s.r.o.
  • Renzo Praha s.r.o.
  • Ergo CZ s.r.o.
  • JARg s.r.o.
  • REPAM Elektro s.r.o.
  • Kontakt Servis CZ s.r.o.
  • Auto-M s.r.o.
  • LAN System s.r.o.
  • ISOTHERM s.r.o.
  • Beneš nábytek s.r.o.
  • GRAFOBAL BOHEMIA s.r.o.
  • ČESKÉ FARMY s.r.o.
  • VEIDEC s.r.o.
  • and many more

Is your domain set up securely?

Check your MX, SPF, DKIM and DMARC records for free and get tips on what to improve.

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