...yahoo also likes dkim...
-<record>
-<row>
<source_ip>89.xx.xx.116</source_ip>
<count>3</count>
-<policy_evaluated>
<disposition>none</disposition>
<dkim>pass</dkim>
<spf>pass</spf>
</policy_evaluated>
</row>
-<identifiers>
<header_from>domain.it</header_from>
</identifiers>
-<auth_results>
-<dkim>
<domain>domain.it</domain>
<result>pass</result>
</dkim>
-<spf>
<domain>domain.it</domain>
<result>pass</result>
</spf>
</auth_results>
</record>
now let's move on to studying DMARC and SPF settings. Thank you all!