Blocked BAD-HEADER

[Robert Moskowitz]

I just found out why I may be not getting some reports from a service I 
am paying for:

Sep 26 18:45:25 z9m9z amavis[1017]: (01017-11) Blocked BAD-HEADER, 
[31.170.123.1
34] [207.38.86.27] <webchaver at web556.webfaction.com> -> 
<rgm at htt-consult.com>, M
essage-ID: <20180926184510_3419600 at webchaver.org>, mail_id: 
9nRpQDcZqcXK, Hits:
-, size: 59594, 1698 ms

This is an old mailserver that I am working on updating.  Currently it 
is running

amavisd-new-2.6.4-2.el6.noarch

there have been a number of these emails blocked  I can't see any 
obvious setting in amavis.conf on this.

How can I let these through to figure out what is wrong to tell them 
what to fix?

In typically have 50 blocked emails per day now that I fixed another 
issue.  this source is one a week.