Errors-To header line problems

[Neil Gorsuch]

How do I keep the sendmail program/configuration file from expanding the
data in the Errors-To: header line?  I recently upgraded from Sunos 3.5 to
4.0.1.  In SUnos 3.5, the Errors-To line would just be passed through, but
in Sunos 4.0.1, the sendmail appears to apply full aliasing expansion to
the Errors-To data.  There is an "Errors-To: %s" string in /usr/lib/sendmail,
which would appear to be the culprit.  There is also an "HErrors-To:" line
in the sendmail.cf file, but nothing changes when I experiment with it.
I can't bypass sendmail, and I need errors sent back to an alias which 
expands to various destinations.  Thanks in advance,

Neil Gorsuch
neil at cpd.com
uunet!zardoz!neil
(714) 546-1100