Fix 1: Set your email to reject forged mail
Attackers can send fake invoices and emails from your domain and recipients have no authoritative way to reject them.
- Where it is doneYour DNS settings
- Rough timeAbout 20 minutes a stage, over two to four weeks
dig TXT _dmarc.harbourview-llp.example +short @1.1.1.1The steps (11)
- In the Microsoft Defender portal, go to Email & collaboration, then Policies & rules, then Threat policies, then Email authentication settings. Open the DKIM tab and check that signing is on for harbourview-llp.example. If it is not, publish the two CNAME records it shows at your DNS host and turn signing on.
- Your SPF record lists one service that sends mail for harbourview-llp.example (Microsoft 365), so start at p=quarantine. Publish this record at _dmarc.harbourview-llp.example: v=DMARC1; p=quarantine; rua=mailto:[email protected]
- The reports go to the LeakTrace report desk at [email protected]. You can put a mailbox of your own in its place.
- Sign in to the company that runs the DNS for harbourview-llp.example. It is the one whose name servers your domain uses, which is not always where you bought the domain.
- Open the DNS records for harbourview-llp.example. The screen is usually called DNS, DNS records or Zone editor.
- Add a new record and choose the type TXT.
- Type _dmarc as the name. If the screen does not add your domain itself, type _dmarc.harbourview-llp.example.
- Paste the record above as the value, exactly as copied.
- Save the record.
- Read the reports for about two weeks. When no mail your firm really sends is landing in spam, change p=quarantine to p=reject in the same record.
- The general steps for any DNS host are at getleaktrace.com/fix/.