блин протупил:
#dig domen.net.ua MX; <<>> DiG 9.4.2-P2 <<>> skm.net.ua MX
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 64904
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;domen.net.ua. IN MX
;; AUTHORITY SECTION:
domen.net.ua. 3031 IN SOA ns3.ipromogroup.com. hostmaster.iname.com.ua. 2009122402 14400 7200 604800 3600
;; Query time: 9 msec
;; SERVER: 91.203.140.2#53(91.203.140.2)
;; WHEN: Wed Jan 13 00:04:24 2010
;; MSG SIZE rcvd: 104
Как только добавил
MX для @.domen.net.ua все заработало