550 5.1.1 USER UNKNOWN

[#1]

Linux webserver behind fg60: A few users complain that people that used to be able to e-mail them can' t. I requested one of the returned messages as follows: +++++++++++++++++ From: System Administrator Sent: Thursday, April 30, 2009 3:53 PM To: Judy Borgerson Cc: ' kevin@wildrowspump.com' Subject: Undeliverable: email Your message did not reach some or all of the intended recipients. Subject: FW: email Sent: 4/30/2009 3:53 PM The following recipient(s) could not be reached: ' kevin@theirdomain.com' on 4/30/2009 3:53 PM 550 5.1.1 <kevin@wildrowspump.com>... User unknown +++++++++++++++++ and another: +++++++++++++++++ > The message could not be sent because one of the recipients was rejected = > by the server. The rejected e-mail address was = > ' alyson@wildrowspump.com' . Subject ' FSR Proof' , Account: = > ' mail.imagepress.ca' , Server: ' smtp.imagepress.ca' , Protocol: SMTP, = > Server Response: ' 550 5.1.1 <alyson@wildrowspump.com>... User unknown' , = > Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79 +++++++++++++++ their dns is setup at EasyDNS, consulting with them they say all is ok. don' t know what to do, they are valid users, most outside people can e-mail them, but more and more can' t. thanks in advance for any help/

[abelio]

Hello, it seems not to be fortigate related.. in your shoes, i' ll re-check /etc/resolv.conf entries in the linux server and test those listed dns servers to determine if it can be able to resolve wildrowspump.com domain... a worst situation could be that wildrowspump.com domain be defined as local domain in that linux server.... but this is really off topic for this forum.

[#3]

Abel

Sorry Abel , I did not intend to step outside the forum topic/generosity of knowledge etc. As it turned out the domain was previously hosted at TELUS. When the client decided to host internally, TELUS had not purged their dns cache/records, so any sender on the TELUS netowk was not getting through. Thanks, maybe this will help someone in the future, Dan