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Hotmail.com dkim=fail (signature did not verify), while pass on Gmail and Port25

Hello. I am in process to set up a new UTM9 SG230 (Last firmware ver) appliance on our network, and while setting DKIM signing faced some strange problem: DKIM authentification passes on GMAIL and Port25 domains, but when I send a mail to Hotmail.com - it says "hotmail dkim=fail (signature did not verify)"

I am wondering if that my fault or Hotmail.com (MS) treats the mail from Sophos UTM (Exim mail-server I believe) in a wrong way?

Thanks



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