Network Tools
Network and email-infrastructure math that's easy to get wrong by hand, subnet masks, DNS lookups, SPF/DMARC checks, header analysis. A mail header or an internal IP range isn't something you want relayed through someone else's server.
Network and email-infrastructure math that's easy to get wrong by hand, subnet masks, DNS lookups, SPF/DMARC checks, header analysis. A mail header or an internal IP range isn't something you want relayed through someone else's server.