DKIM Signature is not valid

[yuricl]

I'm having trouble sending mail, everyone is going straight to spam in Gmail or arrives.

Reason that DKIM signature are not valid.

example

"k=rsa; p=MIGfMA0GCSqSFdg4533DQEBAQUAA4GNADCBiQKBgQC7spknvThTQGD/n86DbLm0SDAAJaBNbTKKL3XmEpNS6VNxh7EAE06MufFl8kosTt5nT7tP3N/DyDfdggVNuoAGMe25+vzJ/5OQqF2MDbAXwfIxdBkjQqqhSMO3dyP5QBQZ2cgumNqxWhn76WXRx7GSNyQZXBBgUU7KNXQlndbTvwIDAQAB"

I added in Domain registration company still does not work.

I use the " "

Thanks