<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt">Dear all - I run <A style="POSITION: static; TEXT-DECORATION: underline !important" id=KonaLink0 class=kLink href="#" jQuery1299030103166="5">Nagios</A> Core 3.2.3 and running postfix as mt mta agent in Ubuntu 10.4. I have setup nagios alerts to send to me and to send to our ticketing system which is <A href="mailto:ticket@csaa.com">ticket@csaa.com</A>. My ticketing system has a auto responder which responds to end users so with that basically whenever Nagios sends alerts to <A href="mailto:ticket@csaa.com">ticket@csaa.com</A> it auto responds to nagios - unfortunately it fails: Your message could not be delivered to one or more recipients. It's attached below. For further assistance, please <A style="POSITION: static; TEXT-DECORATION: underline !important" id=KonaLink1 class=kLink href="#" jQuery1299030103166="4">send mail</A> to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <nagios@monitor22.csaa.local>: Host or domain name not found. Name service error for name=monitor22.csaa.local type=A: Host not found My question is, how can I make Nagios/Postfix receive emails within? Pls kindly advise mates. Cheers, DB</div> </body></html>