What is "Malformed privilege data"?

[rpb1@cornell.edu]

I've recently rebuilt my linux system with new glibc 2.1, kernel 2.2 and
egcs 1.1.1, and have had no real problems, except that zmailer is behaving
really strangely. When I use fetchmail to get my mail and send it into my
system, the router logs say "Malformed recipient privilege data!" and the
messages get deferred. But I have no problems that I can find sending mail
through other means--in fact, I can send messages to the same addresses as
in the deferred messages and they go through fine! But I can not send the 
deferred messages, even if I cut off the envelope and pipe them back to 
sendmail.

I have been completely unsuccessful if finding out what this error means. 
I looked in the documentation, and the router config files, but found no
references. I read throught the current list archive, and found some 4 or
so questions about "Malformed privilege data", but not one answer. I tried
turning on debugging info for the logger, and saw that it looks like
"good" messages have a 4th router field that says "g3" or "g4" and "bad"
messages have "g1" or "g2" and I looked in the source, and found the error
message, but it was in a mess of stuff that I don't really want to
decipher even as much as I have and I get different results when I try the
router interactively (4th field is always "default_attributes" unless the
address hist an alias, in which case I get a "g7" or something similar),
so I come back to the list.

Could someone tell me what this error means, and/or how I can go about
tracking down what is actually wrong? Everything else works, and I'm
pretty sure this is the same zmailer setup I was using before (not the
same setup _files_ of course, since there have been code changes).

Also, I have a message from error that got deferred, and it says
"malformed sender" as well as "malformed recipipient privilege data".
What's wrong with "error"? 

Oh, and this is for zmailer version 2.99.50-s11.

Thanks for _any_ help,
Robert Braddock
rpb1@cornell.edu