MX Record Lookup Gateway
This only works with valid hostnames.
Perfom a different type of test on the same domain:
NSLookup Gateway - queries 15 major US nameservers and several foreign nameservers.
Custom NSLookup Gateway - do your own lookup off of the DNS server that you want.
MXLookup Gateway - same as above, but it looks up the MX (Mail Exchanger) for hosts.
RBL Lookup - checks to see if a host/IP # is on any Realtime Blackhole Lists.
Open Relay Tester Tool - attempts to relay a single message through a remote mail server.
Whois Lookup - checks domain to see if its registered. And if so, it provides info on it.
RWhois Lookup - Referral Whois, similar to whois but with more info
Traceroute Tool - traces the route to said host and sends 10 packets and reports the results.
Long(er) Traceroute Tool - traces the route to said host and sends 50 packets and reports the results.
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