I followed a link from another site that had an identical question posted as solved on this site, but the link resulted in a 404. I found the other links to pam failure, and I tried changing dovecot.conf as mentioned in the other solution. Actually, the error posted above, no longer shows up, but I still cannot authenticate. passdb { args = %s driver = shadow } but that did not work. /var/log/mail.log
davomail postfix/smtpd[19906]: NOQUEUE: reject: RCPT from mail-yw0-f173.google.com[209.85.161.173]: 454 4.7.1 : Relay access denied; from= to= proto=ESMTP helo=
dovecot.conf
disable_plaintext_auth = no mail_privileged_group = mail mail_location = mbox:~/mail:INBOX=/var/mail/%u userdb { driver = passwd } passdb { args = %s driver = passwd } protocols = " imap" service auth { unix_listener /var/spool/postfix/private/auth { group = postfix mode = 0660 user = postfix } } ssl=required postconf -n alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases home_mailbox = Maildir/ inet_interfaces = all local_recipient_maps = proxy:unix:passwd.byname $alias_maps mailbox_size_limit = 0 mydestination = mail.domain.com, domain.com, localhost localhost.localdomain mydomain = davomail.com myhostname = mail.davomail.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname recipient_delimiter = + relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_tls_cert_file = /etc/ssl/certs/mailcert.pem smtpd_tls_key_file = /etc/ssl/private/mail.key smtpd_tls_protocols = !SSLv2, !SSLv3 smtpd_tls_security_level = may smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes 