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Why does the DKIM validation for my mailserver fail for Yahoo but nor for others ?

I saw this question, but I don't think it's the same issue and the answer was not helpful to me.

MxToolbox gives no errors.

Yahoo says:

header_from = mail.my-domain.de

while Google correctly (?) splits it up to

header_from = my-domain.de
selector = mail

Might this be the issue and if so, how to solve ?


DKIM Record:

mail._domainkey TXT v=DKIM1; h=sha256; k=rsa; p=......

MX Record:

@ MX 10 mail.my-domain.de

Report from Yahoo

  <record>  
    <row>   
      <source_ip>xxxxxxxxx</source_ip>  
      <count>1</count>  
      <policy_evaluated>    
        <disposition>none</disposition> 
        <dkim>fail</dkim>   
        <spf>pass</spf> 
      </policy_evaluated>   
    </row>  
    <identifiers>   
      <header_from>mail.my-domain.de</header_from>  
    </identifiers>  
    <auth_results>  
      <dkim>    
        <domain></domain>   
        <result>neutral</result>    
      </dkim>   
      <spf> 
        <domain>mail.my-domain.de</domain>  
        <result>pass</result>   
      </spf>    
    </auth_results> 
  </record> 

Report from Google, similar from others:

  <record>
    <row>
      <source_ip>xxxxxxxxx</source_ip>
      <count>3</count>
      <policy_evaluated>
        <disposition>none</disposition>
        <dkim>pass</dkim>
        <spf>pass</spf>
      </policy_evaluated>
    </row>
    <identifiers>
      <header_from>my-domain.de</header_from>
    </identifiers>
    <auth_results>
      <dkim>
        <domain>my-domain.de</domain>
        <result>pass</result>
        <selector>mail</selector>
      </dkim>
      <spf>
        <domain>my-domain.de</domain>
        <result>pass</result>
      </spf>
    </auth_results>
  </record>

IP is the same for both and valid.

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