* * * * * I think I'd prefer snakes at this point It took a bit more than just setting pop3_uidl_format to get Microsoft [DELETED-Lookout-DELETED] Outlook to fully work with the email system [1] on the dedicated server. The customer could receive mail, but not send. I'll spare you the details (namely because I want to spare myself the details) but to get Outlook to work with dovecot [2] and postfix [3]. In /etc/postfix/main.cf: > smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination > smtpd_sasl_auth_enable = yes > smtpd_sasl_local_domain = $myhostname > smtpd_sasl_path = private/auth > smtpd_sasl_security_options = noanonymous > smtpd_sasl_type = dovecot > And in /etc/dovecot.conf: > ssl_disable = no > > auth default { > mechanisms = plain digest-md5 cram-md5 login > passdb passwd-file { > args = /etc/dovecot-passwd > } > > # and because once isn't enough ... > > userdb passwd-file { > args = /etc/dovecot-passwd > } > > socket listen { > client { > path = /var/spool/postfix/private/auth > mode = 0660 > user = postfix > group = postfix > } > } > } > > # and from yesterday ... > > pop3_uidl_format = %08Xu%08Xv > Oh, and make sure saslauthd is running. [1] gopher://gopher.conman.org/0Phlog:2006/09/12.1 [2] http://www.dovecot.org/ [3] http://www.postfix.org/ Email Sean Conner at sean@conman.org .