Signature causing blank emails

[Ricardo Branco]

Centos+MailScanner+Sendmail+DovecotLDA

Since upgrading to the latest MS version (4.78.17-4 from rpm.tar.gz) it 
seems that now that always tries to sign internal messages even though I 
have the same config as before.

From:           10.0.0.                 yes
FromOrTo:       default                 no


This is causing issues where it tries to sign a HTML message that 
already has a HTML signature, I then end up with a blank email with a 
few attachments.