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Below Email Hosting FAQ asked by admin

ABOUT MX LOOKUP This test will list MX records for a domain in priority order. The MX lookup is done directly against the domain’s authoritative name server, so changes to MX Records should show up instantly. You can click Diagnostics , which will connect to the mail server, verify reverse DNS records, perform a simple Open Relay check and measure response time performance. You may also check each MX record (IP Address) against 147 DNS based blacklists . (Commonly called RBLs, DNSBLs) http://www.mxtoolbox.com/Public/Tools/MxLookup.aspx

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