Consistent errors in log

[G. Armour Van Horn]

Greetings:

I'm getting constant entries like this in maillog.

Apr 14 17:58:33 vanguard sendmail[6944]: l3EMwNgX006935: SYSERR(root): 
header syntax error, line "X-Domain Van Horn-MailScanner-Information: 
Please contact the ISP for more information"
Apr 14 17:58:33 vanguard sendmail[6944]: l3EMwNgX006935: SYSERR(root): 
header syntax error, line "X-Domain Van Horn-MailScanner at vanguard: 
Found to be clean"
Apr 14 17:58:33 vanguard sendmail[6944]: l3EMwNgX006935: SYSERR(root): 
header syntax error, line "X-Domain Van Horn-MailScanner-From: 
srs0+7dv/+27+bar.baen.com=honorverse.listmanager at webwrights.com"

I'm not sure if I get it from every message, but certainly from a lot of 
them. It's always the same set of three lines. It doesn't seem to 
interfere with the flow of mail, but I'd rather not to have to wade 
through them and if it means I've configured something wrong I'd prefer 
to fix it. But what is it?

Van


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