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Error sending message! 550 <User@>, Recipient unkn

Error sending message! 550 <User@>, Recipient unkn

Error sending message! 550 <User@>, Recipient unkn

(OP)
Hi!
I'm new to Mdaemon, i have installed Mdaemon 10.2 and set it up to the best of my knowledge... but i cant get it to work right

I have a win 2003 server running with a static ip and ports 25,110,143and 3000 open and working i can connect throug the webmail feature but when i try to send mails form anny accounts i get this msg Error sending message!  550 <"user"@nordic-vikings.net>, Recipient unknown without the "user" that is, i have the mx record set up to my server and all... i have even tryed to set it to send throug my ISP's smtp server but still no go... annyone got anny ideas??

RE: Error sending message! 550 <User@>, Recipient unkn

Did you manage to solve your problem?

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