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Titre
Defender email tokens are not being sent via Exchange; Defender warning "Failed to send 0x80004005" and "The server response was: 5.7.1" is seen in the Defender log -
Description
When using the Defender OTP Email tokens, the tokens are not being sent. When reviewing the Defender logs, a warning such as this is returned:
"Fri 06 Oct 2017 18:14:33 Defender E-mail OTP: Failed to send 0x80004005Fri 06 Oct 2017 18:14:33 Defender E-mail OTP: Error : Unexpected error sending an e-mail.Fri 06 Oct 2017 18:14:33 Defender E-mail OTP: Exception : System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 <first.last@domain.com>... Relaying denied" -
Cause
The error 5.7.1 is an Exchange warning indicating "Unable to Relay". -
Résolution
If the Exchange warning 5.7.1 is being returned, review the configuration of Exchange to ensure that relaying is correctly configured for this connection.