// how to fix
Not sure what is wrong?How to fix email problems
Your test or scan found a problem? Find the matching guide below: what it means, why it matters, and how to fix it step by step.
Bounce 40
DNS 36
DMARC 33
Reputation 33
SPF 30
DKIM 27
Gmail 19
Security 19
Blacklist 18
Content 14
Headers 11
Mailing list 11
Spam score 11
Reverse DNS 10
Microsoft 365 8
Outlook 8
Mail server 7
MX 5
Yahoo 4
TLS 3
Apple 2
Google Workspace 2
BIMI 1
E-commerce 1
GMX 1
WordPress 1
Zoho 1
1 guides · tag GMX
| Problem | In short | Tags | |
|---|---|---|---|
| GMX / WEB.DE "554 Transaction failed / Reject due to policy restrictions" and "invalid DNS PTR resource record": fix | GMX and WEB.DE refuse servers without a valid reverse DNS (PTR) or with a poor reputation. How to read the error and fix your server. | Fix it |
Not sure what is wrong?
Send a test email or scan your domain: the report tells you which problem you have.