"DKIM-Signature header exists but is not valid" ERROR

Hi,

I am having complains from our clients that their mails are always going to spam folders istead of inbox.
I decided to have some tests and find out problems which couse the issue and solve them.
We have PTR records correctly,
Our IPs and domain names are not listed in any blacklists,
And I checked "Use DomainKeys" checkbox for all our domains in mail settings.

These were all good and thought that all works well untill I ran a test on http://spamcheck.postmarkapp.com/.
I...

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