LocalHost in header quarantined by spam filter

[gameover]

I have a redhat 7.3 running default sendmail config. I use mutt as a client to send an email to an outside company.

sampler header

Received: (from root@localhost)
by myhost.foo.com (8.11.6/8.11.6)


The outside company is marking this as spam because of the localhost. I understand that this header is from the mutt to sendmail transfer. Does anyone know how to strip this from the email or rename it to myhost.foo.com?


Thanks in Advance.