How to configure DKIM for sending email from my domain

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Hi

I have recently been spammed and as result the domain http://studiorel.co.uk has been effected and now all emails sent to gmail,yahoo,hotmail and aol users end up in users spam folder.

In an effort to fix the issue, i have setup private name servers, which point to the vps (and also because, cpanel required the server to be an authorative nameserver for domain). After setting up the name server, i am no longer getting any error messages in cpanel for email authentication.

I then also setup a DMARC dns record for the domain. However, it appears that when sending mail via smtp on the server, there are issues with the DKIM signature. I am getting reports from Yahoo, whom are sending a report with errors (i think for which i cannot make head or tail of).

So my quetsion is what am i doing wroing? Is there another step i need to do? why are the emails sent via smtp from the server not being signed with a valid signature?

I look forward to your replies.
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Commented:
Was DKIM ever working properly?  Try testing it with MX Toolbox:

http://mxtoolbox.com/dkim.aspx

Is outbound email routed through a smarthost?  If you just need a quick bandaid you could remove the DKIM piece from the equation and just use SPF.

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Commented:
Keyser,

I just tested on the tool and it appears that the DKIM is valid.

the selector is default and your is studioel.co.uk.


Also emails are still going to users junk folder
Commented:
The fact email is still being flagged as spam may just indicate you're still on an internal Yahoo list.  If the DKIM and DMARC configs are valid you're only option at this point is to work directly with Yahoo and request they remove whatever rule is tied to your domain.  Nine times out of ten providers like Yahoo will take you off the list if you write an email to support and describes what steps have been taken to rectify the situation.

Review this article specifically as it relates to Yahoo and you should be good:

https://www.rackaid.com/blog/how-to-remove-your-email-server-from-yahoos-blacklist/

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