Postfix Ignoring lmtp, delivering straight to maildir

[Doug Barton]

Looks like this is a dovecot problem after all. :)

I can get Postfix to deliver to lmtp, but it's telling it to deliver to 
a fully qualified 'user at domain.tld' address. Postfix says that it can't 
find that user, and that turns out to be the case.

dovecot: auth: Debug: master in: 
USER#0112#011user at domain.tld#011service=lmtp

So I read up on that error, and it looked like I needed to do this in 
auth-system.conf.ext

userdb {
   driver = passwd
   override_fields = username_format=%n
}

But that didn't work, same error.

So how do I convince dovecot that user at domain.tld is really local Unix 
account named "user" ??

Doug