Authentication is required with SMTP server. Otherwise, one of the following error messages will be displayed.
550 Relaying is prohibited.
550 5.7.1 Unable to relay.
550 Relaying denied.
554 Relay access denied.
Error message may differ among SMTP server software. The solution is to authenticate with mail server, using AUTH parameter.
When SMTP authentication is required, use -AUTH AUTO command for automatic authentication. Also, user name and password has to be provided, using -USER and -PASS parameters.
C:\>febootimail -SERVER smtp.server.com -FROM email@example.com -TO firstname.lastname@example.org -TEXT Mail server authentication example -AUTH AUTO -USERNAME john -PASSWORD Joh2$8n
Example with Gmail authentication.
This article may be referenced as (KB ID: 516).
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