Problems setting up DKIM on Linux / DA VPS

I'm having a problem with sending e-mails directly from the mailserver to Microsoft mail accounts (Live, Outlook, Hotmail, etc). These e-mails are being send from admin@mail.example.com (this is an example, but the 'mail'-subdomain is included in the full address). When the mail arrives, it says that the SPF record has been passed, but DKIM doesn't show up. See here:

Code:

CMM-Authentication-Results: hotmail.com; spf=pass (sender IP is redacted)
smtp.mailfrom=admin@mail.example.com; dkim=none
header.d=xampledomain.net; x-hmca=none
header.id=contact@exampledomain.net

I followed this tutorial to set up the DKIM:

http://ift.tt/2aFHdZp

I verified that it has been enabled:

Code:

[root@VPS /]# cat /usr/local/directadmin/conf/directadmin.conf | grep dkim
dkim=1

I then went to the admin panel, User Level, and coppied the whole record to the DNS-configuration at my provider. Note that I'm using a VPS myself. When I dig it through the command line, I see that it resolves:

Code:

[root@VPS /]# dig txt x._domainkey.mail.example.com


; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.47.rc1.el6 <<>> txt x._domainkey.mail.example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 15635
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0


;; QUESTION SECTION:
;x._domainkey.mail.example.com. IN  TXT


;; ANSWER SECTION:
x._domainkey.mail.example.com. 617 IN TXT   "v=DKIM1\; k=rsa\; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAru6kqwqnkt1krh/eKle/cP1+wK/lbA4aD1enQUm24BOHjiEQI3/7WB5O1UAZi4f4DZ0sQP3PVJreEZBqtL5dl+d eoU/Qj9oL+qCAe7IHdNgFW3/Fzg3ke8aOvWsPC8o0M5VvYAfibgcFpLCvu5BUqYwqvME3oU7WNK7OSjtPinf1wbFKEGUIh9ZzUcib0JO3" "gRzIxf6qXXu8htmFiNnInPDKHsn4oIioI5gWHiyKXs/EB GupIxrFJOlFmX213iYv/O9W3zpIz/+lOredactedforpurposesrTZgzDIyAb2HXZeSAmT0Rcp/mFMF5dPZw1KA6m/dkmqvwIDAQAB"

What am I missing here, why does Microsoft keep telling me that DKIM is not enabled?

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Problems setting up DKIM on Linux / DA VPS