How the Čistý mail anti-spam works
Mail for your domain passes through our servers first. It is filtered there and only clean messages reach your mail server.
Internet
Mail for your domain comes to us first.
Čistý mail
Modern anti-spam filters, RBL, SURBL, SPF, DKIM, DMARC, anti-virus, Bayesian filters and your own rules.
Your mail server
Your own server in the office, Microsoft 365 or another cloud service. Only clean mail arrives.
Caught
Spam, viruses and phishing stay safely in quarantine.
Administrator
The web administration shows statistics and quarantine and keeps the settings in your hands.
Getting started
Request
Fill in the free trial form with the domain you want to protect.
Activation
We set up the domain and send you admin access and the DNS values.
MX change
You change the domain's MX records to our servers at your DNS provider. That is all.
Done
Once the DNS changes propagate, mail immediately starts flowing through the filter.
All features
- anti-spam and anti-phishing – filtering of spam and fraudulent e-mail
- virus protection – e-mail anti-virus with an up-to-date database
- tagging of dangerous messages (header, subject)
- redirecting dangerous messages to a chosen address
- web admin with settings managed by the customer
- detailed real-time statistics and logs
- details of every message including delivery status
- delivery of spam from quarantine up to 90 days back
- log search and export to Excel and CSV
- e-mail summaries of blocked messages
- two-factor sign-in to the admin (MFA)
- history of sign-ins and settings changes
- an intelligent system that learns from your mail flow
- custom blacklist and whitelist
- SSL/TLS encrypted communication
- modern anti-spam filters, Bayesian filters, RBL, SURBL
- SPF, DKIM and DMARC checks
- HA cluster for maximum availability
- geographically separate backup
- all infrastructure located in the EU
- processing compliant with the GDPR
- mail backup when your server is down
- 24/7 technical support
- customisation to your needs
For your own server and for the cloud
Čistý mail sits in front of any mail server. Where your mailboxes live is entirely up to you.
- Your own mail server – for companies that want to keep their e-mail in their own hands rather than in the cloud. We protect servers in your office or data centre; messages only pass through our filter and are stored temporarily only when your server is down.
- Microsoft 365 and other cloud services – Čistý mail works as an extra layer of protection in front of cloud mailboxes. You only need to allow delivery from our servers in the destination service; we will help with the setup.
Why a separate anti-spam service
Your mailbox provider catches a lot of spam too. A dedicated service adds things you will not get elsewhere:
- No lost mail during outages – when your server is down, messages wait with us.
- Your rules – you decide what is dropped, what is only tagged and what is redirected.
- Insight into every message – logs and statistics show what was caught and why.
- 24/7 support – a real person helps you, not a form.
- Data stays in the EU – all of the service's infrastructure is located in the European Union and processing meets all GDPR requirements.
A look at the administration
The settings are fully in your hands. Here are a few screens of the web administration (the interface is in Czech).
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.
Checks before accepting a message
Choose which checks run during the SMTP connection – RBL lists, SPF and greylisting.
E‑mail summaries
An overview of blocked messages every 3 hours, daily or weekly – for the whole domain or for individual recipients.
Try it on your own domain
Free for 30 days, no obligation.