Mail In SPAM

[kkonline]

Hi,
I am using bind9 on debian etch vps server. Have postfix installed. I noticed one thing that incase a mail is sent with smtp server localhost it goes to spam but incase it is sent from any other smtp server like gmail for example then it reaches inbox.
xxx.x.xxx.rev

$TTL 1d ;
$ORIGIN xxx.x.xxx.IN-ADDR.ARPA.
@       IN      SOA     ns1.net4india.com.    (
                                       2007011501
                                       7200
                                       120
                                       2419200
                                       604800
)
        IN      NS      ns1.net4india.com.
        IN      NS      ns2.net4india.com.
1       IN      PTR     ns1.net4india.com.
2       IN      PTR     ns2.net4india.com.

mydomain.org.db

;
; BIND data file for mysite.org
;
$TTL    604800
@       IN      SOA     mysite.org. (
                            2007011501         ; Serial
                                  7200         ; Refresh
                                   120         ; Retry
                               2419200         ; Expire
                                604800)        ; Default TTL
;
@       IN      NS      ns1.net4india.com.
@       IN      NS      ns2.net4india.com.
mysite.org.    IN      MX      10      mail.mysite.org.
mysite.org.    IN      A       xxx.x.xxx.xxx
www                     IN      CNAME   mysite.org.
mail                    IN      A       xxx.x.xxx.xxx
ftp                     IN      CNAME   mysite.org.
mysite.org.         IN      TXT     "v=spf1 ip4:xxx.x.xxx.xxx a mx ~all"
mail                    IN      TXT     "v=spf1 a -all"

Your suggestions required on the same

[falko]

Please take a look at the email header. SpamAssassin should add something to the header that indicates why the mail got marked as spam.

Also, make sure your server has proper PTR records, and that your domains have SPF records.