complete email centos postfix dkim spamassassin
Remove sendmail yum remove sendmail Postfix yum install postfix yum install cyrus-sasl cyrus-sasl-devel cyrus-sasl-gssapi cyrus-sasl-md5 cyrus-sasl-plain /etc/postfix/main.cf myhostname = mail.example.com mydomain = example.com myorigin = $mydomain home_mailbox = Maildir/ mailbox_command = mynetworks = 127.0.0.0/8 inet_interfaces = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain relay_domains = local_recipient_maps = smtpd_sasl_local_domain = smtpd_sasl_auth_enable = yes smtpd_sasl_type = cyrus smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_sasl_authenticated_header = yes smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination /etc/postfix/master.cf smtps inet n - n - - smtpd -o smtpd_sasl_auth_enable=yes -o smtpd_reject_unlisted_sender=yes -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject -o broken_