I have tried to check my domain via zonecheck (http://www.sixxs.net/tools/zonecheck/), the tool says that it cannot send an email to my domain (snb.it), the emails are rejected by my server's spf checks because they are sent by an host not allowed to sent emails, actually zonecheck tries to send email from sixxs.org and in this domain you have this txt record: sixxs.org descriptive text "v=spf1 -all" Emails should be sent by sixxs.net domain or the txt record in sixxs.org dns entry should be fixed. Regards Giovanni Bechis