is the “unknown” in the path of this email, the source of the delay and does it occur prior to leaving Docusign?

Created at: 6/6/2016, 1:05:58 PM PDT ( Delivered after -13 sec )

SPF: pass

DKIM: pass

DMARC: pass

# Delay From * To * Protocol Time received
0 docusign.net CHFE28.corp.docusign.net 6/6/2016, 1:05:58 PM PDT
1 3 sec unknown → mailch.docusign.net ESMTP 6/6/2016, 1:06:01 PM PDT
-16 sec mailch.docusign.net[Google] mx.google.comESMTPS 6/6/2016, 1:05:45 PM PDT
3 → [Google] 10.36.65.162 SMTP 6/6/2016, 1:05:45 PM PDT
4 → [Google] 10.103.10.198 SMTP 6/6/2016, 1:05:45 PM PDT

Is the "unknown" in the path of this email, the source of the delay? Does it occur prior to leaving Docusign? Does it provide an oppertunity for tampering to occure?