Ive got some issue with email forwarding. Through the ISPConfig 3.0 i've set some email forwards. When I'm trying to send the email on the forward address daemon is returning the message with error 521, which mean that message is spam. But on the second hand, when i'm trying to send the email direct on the address without the forward - the same topic and content - the email easly go to the inbox. Where can be the problem? Whole error message:
<@ameritech.net> (expanded from <@forward-domain.com>): host aitmx9.prodigy.net[207.115.37.22] said: 553 5.3.0 nlpi147 DNSBL:ATTRBL 521< ... >_is_blocked.__For_information_see_http://att.net/blocks (in reply to MAIL FROM command)