Saturday, March 1, 2014


SMTPDIAG is an utility from Microsoft that is a diagnostic tool to determine if Simple Mail Transfer Protocol (SMTP) and Domain Name System (DNS) are configured correctly to deliver mail to an external e-mail address.  The application can be downloaded at:

The syntax for the application is:

SMTPDIAG "sender address" "recipient address" [-d target DNS] [/v]


Below is an example of the –d switch to specify a DNS server to use, as well as the /v switch to include more details.


The following error may be returned when the server is not an Exchange server and is not a member of an Active Directory domain.


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