I Have the server "afspraakmanager.be". It matches everything not to be a spam server.(it isn't by the way): it has reverse dns, spf,dkim,... . But hotmail marks it as spam.

I think the problem is the SPF/DKIM records. when i sent an email to my gmail it says:

"Received-SPF: neutral (google.com: 2a02:348:8e:6048::1 is neither permitted nor denied       
by best guess record for domain of [email protected]) client-ip=2a02:348:8e:6048::1;
Authentication-Results: mx.google.com;
spf=neutral (google.com: 2a02:348:8e:6048::1 is neither permitted nor denied by best
guess record for domain of [email protected]) [email protected];
dkim=neutral (bad format) [email protected]"

So i guess my SPF and DKIM records aren't set up right. But I also don't have a clue what is wrong with them.

this is the zone file:

 ; zone file for afspraakmanager.be

 $ORIGIN afspraakmanager.be.
 $TTL 3600

@    86400    IN SOA ns1.eurodns.com. hostmaster.eurodns.com. (
      2013102003 ; serial
      86400 ; refresh
      7200 ; retry
      604800 ; expire
      86400 ; minimum
      )

@    86400    IN NS    ns1.eurodns.com.
@    86400    IN NS    ns2.eurodns.com.
@    86400    IN NS    ns3.eurodns.com.
@    86400    IN NS    ns4.eurodns.com.

; Mail Exchanger definition
@    600    IN MX    10 smtp

; IPv4 Address definition
@        IN A    37.230.96.72
afspraakmanager.be    600    IN A    37.230.96.72
localhost    86400    IN A    127.0.0.1
smtp    600    IN A    37.230.96.72
www    600    IN A    37.230.96.72

; Text definition
default._domainkey    600    IN TXT    "v=DKIM1\\; k=rsa\\;      p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC6pvlZKnbSVXg1Bf3MF2l8xRrKPmqIw2i9Rn1yZ3HEny9qH1vyGXUjdv2O0aQbd5YShSGjtg5H/GedRMLpB0Qb+hBj1yGofOQTdcVtZZfj8qBY5Z7vEkhvtdaogQ0vLjgcwhg0BBuTewEkLxrl9IIzkPMZ1SCtM2Y0RtiUhg2cjQIDAQAB"

; Sender Policy Framework definition
afspraakmanager.be    600    IN SPF    "v=spf1 a mx ptr +all"

The DKIM signature in the header:

    DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=afspraakmanager.be;
s=mail; t=1382361029;
bh=4pDpXBY8rCbX8+MfrklZzpQxaUsa3vSPUYjcDR3KAnU=;
h=Date:From:To:Subject:From;
b=SoBBaAlrueD8qID8txl2SBSqnZgN2lkPCdSPI/m7/YLezIcBedkgIX1NswYiZFl6Z
 AmF8dES73WUaaJjItVHSrdCJK2mJ/Az+vrgNsyk+GqZZ1YPiIlH3gqRrsguhoofXUX
 /gqLlqsLxqxkKKd9EbSzKRHuDGlJCLm5SlL8wnL0=