Technical guides for every NetTools.tech tool — what it does, how it works, how to read the results and how to troubleshoot — plus articles for system administrators, DevOps engineers and security professionals.
Tool guideEmail Tools
A quick yes/no blocklist overview for a mail server IP or domain: how DNSBL checks work, which default lists the NetTools.tech Email Blacklist Check queries, and how to act on a listing.
Tool guideEmail Tools
How RBL and DNSBL queries work, which lists the NetTools.tech MultiRBL Check queries through its own resolver, what listed, not listed, timeout and provider unavailable mean, and what to do when an IP is listed.