Simply add a forwarder for that email address and forward its mail to the special token:
:fail:All mail arriving for that email address will be immediately rejected by our network with an SMTP error. No mail will be delivered to that email address even if a mail account exists for it.
See also the DirectAdmin online help at:
http://www.site-helper.com/email.html#forwardersIMPORTANT: Leave the Catch-All E-Mail setting at "Fail". All other Catch-All settings will not work correctly and may cause mail to be lost. See also:
This document is: http://faq.rahul.net/cgi-bin/fom.cgi?file=44
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