Error 550; recipient address rejected. :(

[Kasyx]

Running postfix/spamassassin. Anyone know what the issue is here, or, moreover, how to fix it?

Thanks

 

[sn3rd]

No other info?

 

[Kasyx]

helo=<xxx>
Mar 28 12:51:23 server postfix/smtpd[27449]: 0ADC33EB03: client=unknown[192.168.0.10]
Mar 28 12:51:24 server postfix/smtpd[27449]: 0ADC33EB03: reject: RCPT from unknown[192.168.0.10]: 550 <xxx@xxx>: Recipient address rejected: Domain not found; from=<xxx@xxx> to=<xxx@xxx> proto=ESMTP helo=<xxx>
Mar 28 12:51:27 server postfix/smtpd[27449]: 10B833EB03: client=unknown[192.168.0.10]
Mar 28 12:51:31 server postfix/smtpd[27449]: 10B833EB03: reject: RCPT from unknown[192.168.0.10]: 550 <xxx@xxx>: Recipient address rejected: Domain not found; from=<[email protected]> to=<xxx@xxx> proto=ESMTP helo=<xxx>

 

[w1z4rd]

helo=<xxx>
Mar 28 12:51:23 server postfix/smtpd[27449]: 0ADC33EB03: client=unknown[192.168.0.10]
Mar 28 12:51:24 server postfix/smtpd[27449]: 0ADC33EB03: reject: RCPT from unknown[192.168.0.10]: 550 <xxx@xxx>: Recipient address rejected: Domain not found; from=<xxx@xxx> to=<xxx@xxx> proto=ESMTP helo=<xxx>
Mar 28 12:51:27 server postfix/smtpd[27449]: 10B833EB03: client=unknown[192.168.0.10]
Mar 28 12:51:31 server postfix/smtpd[27449]: 10B833EB03: reject: RCPT from unknown[192.168.0.10]: 550 <xxx@xxx>: Recipient address rejected: Domain not found; from=<[email protected]> to=<xxx@xxx> proto=ESMTP helo=<xxx>

You are sure the domain exists? checked on http://co.za to make sure there has not being a lapse in payment?

Wow have I being having issues with some of my mail servers today

 

[w1z4rd]

Im also getting this actually.... are you on IS?

 

[Kasyx]

Not sure, we have also been having HUGE issues with some of our clients' mail servers. I will check whether they are IS or not.

 

[Kasyx]

Looks like uunet has been blocked by SORBS

smtpout3.uunet.co.za