Procmail is giving us a periodic error, and I cannot determine why.
It will not deliver mail to some users. For example:
procmail: Unknown user "kiteie"
550 kiteie... User unknown
However, this user does exist and does have a valid mailbox. Subsequent
mail sent to this user will work. For some reason, procmail seems to be
failing randomly and selectively. :(
What version of procmail are you using (type 'procmail -v')? Also,
does the username in the passwd file have any capital letters? If
the account name has uppercase letters and you're running procmail
3.10 or earlier, you'll see this message.
Chris