Walter Messages: 865 Registered: February 2009 Location: Florianopolis / BR
Senior Master Forum Moderator LxCenter Project Manager
Not enough info so I could help you further.
But I'll give you a couple tips.
Follow RFC 2142 guidelines (see item 4). Create an alias or an e-mail to deal with abuse (spam). That's where people or automated systems will try to contact you to solve an issue. If it doesn't exist, go to DNSBL, do not pass go, do not collect $200.
Check APF, BFD and CSF. Special attention to DNSBL. CSF or APF, pick one - never both.