Сделал так. Поставил dovecot
/etc/dovecot/dovecot.conf
protocols = imap pop3
mail_location = maildir:~/Maildir
/etc/dovecot/conf.d/10-auth.conf
auth_mechanisms = plain login
/etc/dovecot/conf.d/10-mail.conf
mail_location = maildir:~/Maildir
/etc/dovecot/conf.d/10-master.conf
#unix_listener auth-userdb {
#mode = 0600
#user =
#group =
#}
unix_listener /var/spool/postfix/private/auth {
mode = 0666
user = postfix
group = postfix
}
/etc/dovecot/conf.d/20-pop3.conf
pop3_uidl_format = %08Xu%08Xv
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
добавил к конфигу postfix`a
/etc/postfix/main.cf
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks, reject_unauth_destination
broken_sasl_auth_clients = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth