Why do I see multiple entries in the DKIM Authentication results column of Aggregate reports?

Some email sending services attach two or more DKIM signatures to the emails they send. In other cases, DKIM signatures added by previous mail servers that handled the message may also be retained.

Because of this, you may see multiple DKIM authentication entries for the same email in the aggregate reports.

This behavior is normal. As long as at least one of the DKIM signatures is aligned with the sending domain, the email will successfully pass DMARC authentication.