On 28.09.2011, at 00:14, terryjames9...@mm.st wrote: > Hello Patrick, > > On Tuesday, September 27, 2011 6:06 PM, "Patrick Domack" > <patric...@patrickdk.com> wrote: >> Using dovecot lda/lmtp you remove all postfix needs to know mailbox >> name to directory mapping, that would be duplicated. > > With using the Dovecot lmtp option, where does Postfix know to refuse > email for a non-existing user or domain? That also has to be shared?
I wondered that as well, and unfortunately the Howto doesn't explain the concept it builds upon. But I found it: it uses LMTP and recipient verification (see reject_unverified_recipient in smtpd_recipient_restictions). See http://www.postfix.org/ADDRESS_VERIFICATION_README.html for details. Rainer
