Enter a domain name of your choice, select the desired operation and click "Check"
This option checks if the IP address that your given domain points to has a proper reverse DNS setup. Enter a domain name that points to your own mail server to check it.
Checks if the SMTP greeting of a given mail server is valid. This will perform multiple checks:
Detects and lists all found mail server and shows problems in relation to their domain name or IP address. Will not connect to the mail servers.
This is similar to the SMTP server greeting test but it will instead test all servers found for a given domain name.