The past few weeks I've started to have this issue on some of my outgoing mail not getting through. The strange part is that it all seems to happen with one domain 'shaw.ca' (my ISP). I am not using my ISP as the outgoing server & the same error has happened while sending mail with my treo.
The errors are as follows:
This is the Postfix program at host kungfu.dreamhost.com.
I'm sorry to have to inform you that the message returned below could not be delivered to one or more destinations.
For further assistance, please send mail to
If you do so, please include this problem report. You can delete your own text from the message returned below.
The Postfix program
******@shaw.ca: Name service error for shaw.ca: Host not found, try again
This report relates to a message you sent with the following header fields:
Date: Tue, 24 May 2005 12:38:00 -0600
From: Dustin - My Company firstname.lastname@example.org
To: *****@thewebstation.ca, ********@shaw.ca
Your message cannot be delivered to the following recipients:
Recipient address: *********@shaw.ca
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 5.1.1 unknown or illegal alias: ********@shaw.ca
Remote system: dns;10.0.121.125 (TCP|10.0.121.160|63914|10.0.121.125|11025) (pd4mr1so.prod.shaw.ca -- Server ESMTP [Sun ONE Messaging Server 6.0 HotFix 1.01 [built Mar 15 2004]])
The issues seem to only happen with emails coming from my dreamhost email accounts, none of my other email accounts are affected.