Protection against fraud
Someone is sending emails in my name – what to do?
Hacked or just spoofed? What to do right away, and how to protect your domain against forged senders.
4 min read
Guides
Email security explained clearly
Short guides for management and IT at SMEs: what is behind SPF, DKIM and DMARC, why emails land in spam and how to protect your domain against forgery.
Practice
Emails not arriving in Outlook or Gmail? Causes
Why Gmail and Outlook reject emails, and the sender rules Google and Microsoft require today.
5 min read
Practice
Blacklist check: is my domain on a blocklist?
How to find out whether your mail server or domain is blocked, and how to get off the list again.
4 min read
Basics
What is DMARC? A simple guide for SMEs
How DMARC protects your domain from spoofed senders and what the three levels mean.
4 min read
Basics
SPF explained: who may send for your domain?
Which servers may send for your domain – and the most common mistakes in the SPF record.
3 min read
Basics
DKIM explained: the digital signature for your emails
How the digital signature makes your emails forgery-proof and what to watch for with the keys.
3 min read
Protection against fraud
Preventing fake invoice emails: a guide for SMEs
How fraudsters operate with fake invoices and changed bank details – and how to protect yourself.
3 min read
Practice
Why do my emails land in spam? Causes and fixes
The most common technical reasons your emails don’t arrive, and what helps against it.
3 min read
Practice
The path to p=reject: step by step
Five steps from p=none to p=reject – without losing legitimate emails.
3 min read
Basics
DMARCbis: what changes
The new DMARC standard since May 2026: what is gone, what is new and how to update your record.
4 min read
Protection against fraud
CEO fraud by email: how SMEs protect themselves
A fake boss wants an urgent payment: how the scam works and which rules really protect you.
3 min read
Protection against fraud
Recognising and preventing email spoofing
Spot forged senders and protect your own domain with SPF, DKIM and DMARC.
3 min read
Practice
Checking and setting up SPF correctly: a guide
How to check your SPF record, spot common mistakes and set it up correctly.
3 min read
Practice
Creating a DMARC record: step by step
The structure of the DMARC record, safe starting values and the path to p=reject.
3 min read
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