From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4.1)
Gecko/20031114

Description of problem:
Upgrading from RH9 to Fedora broke nmh's send capability.  On mailog
the error is of the form:
  postfix/postdrop[XXXX]: fatal: uid=XXX: unexpected record type: 84 
according to these two web posts:
  http://archives.neohapsis.com/archives/postfix/2003-07/0443.html
  http://archives.neohapsis.com/archives/postfix/2003-07/0444.html
this is due to:
  You're using sendmail/postdrop commands
  from different Postfix versions. 

I was using postfix before upgrading and it worked.  I uninstalled
postfix (saving my configuration) did a find for any file named
*sendmail* and did not find anything important (some doc, perl and
emacs files were left).  I re-install Fedora's rpm and the error was
still there.

I then uninstalled Fedora's version one more time, downloaded version
postfix-2.0.16 from postfix.org and installed it.  Works fine.

Postfix seemed to work, just its sendmail interface which nmh expects
didn't

Version-Release number of selected component (if applicable):
postfix-2.0.11-5.i386.rpm

How reproducible:
Always

Steps to Reproduce:
1. install nmh
2. create a draft folder
3. try to send it
    

Actual Results:  Bounces back (from Emacs) fails from the command
line. One line like:
  postfix/postdrop[XXXX]: fatal: uid=XXX: unexpected record type: 84
is appended to /var/log/maillog

Expected Results:  send the message

Additional info:

Only made it fail with nmh.  Not sure whether invoking sendmail
directly will fail.