Outoging email to vind.edu blocked by mailspike.org

We are having a problem with emails being bounced when sending to vind.edu.

v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);}

Reporting-MTA: dns; comomta-ch2-02v.sys.comcast.net [69.252.207.30]
Received-From-MTA: dns; W14HUB-CH2-D5.W14D.comcast.net [172.28.150.22]
Arrival-Date: Fri, 09 Jun 2017 13:20:09 +0000


Final-recipient: rfc822; jevans@vinu.edu
Action: failed
Status: 5.1.1
Diagnostic-Code: smtp; 554 5.7.1 Service unavailable; Client host [69.252.207.30] blocked using bl.mailspike.net
Last-attempt-Date: Fri, 09 Jun 2017 13:20:10 +0000

Going to http://mailspike.org/iplookup.html shows 69.252.207.30 (comomta-ch2-02v.sys.comcast.net with Mailspike reputation as "Very bad reputation".

How can this be fixed?

Please reply to cchristensen@duncanvid.com