Tag: mail flow

Exchange Internal relay accepted domain

Exchange 2007, 2010, 2013, 2016: Reverse DNS configuration

451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain

451 4.4.0 Primary target ip address responded with: 421 4.2.1 Unable to connect

Exchange 2013 cross forest mail flow

Exchange 2013 anonymous email relay

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