Description

Adding internet.nl mail tester to the testing links on the usage page. This testing services gives users in-depth analysis of their mail server, connectivity, DKIM/SPF/DMARC records and DNS.

Type of change

• Improvement (non-breaking change that does improve existing functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• [] I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (README.md or the documentation under docs/)
• If necessary I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes