Issue Dmarc report suspicious

[Davidtina94]

I've recieved a dmarc report from outlook with two records, the first one it's okay, but i got a second record that I can't understand, does any body knows what shoult it mean?
I share the record hidin the ip and domain.

<record>
<row>
<source_ip>xxx.xxx.xxx.xxx</source_ip>
<count>1</count>
<policy_evaluated>
<disposition>quarantine</disposition>
<dkim>fail</dkim>
<spf>fail</spf>
</policy_evaluated>
</row>
<identifiers>
<envelope_to>pco.com.mx</envelope_to>
<envelope_from>&lt;&gt;</envelope_from>
<header_from>mail.mydomain.com</header_from>
</identifiers>
<auth_results>
<spf>
<domain>mail.mydomain.com</domain>
<scope>helo</scope>
<result>none</result>
</spf>
</auth_results>
</record>

I don't know why the dkim is not passig if it always pass, the spf sometimes,
The first stranger thing is that the subdomain "mail". did not appears on any other record before, and the second is is that I got <envelope_from>&lt;&gt;</envelope_from>
Does any one could help me to undertand what does this record means?

Thank you for your help