I'm getting hit pretty hard with spam, and was hoping to reduce it a bit by adding the following smtpd restrictions:
smtpd_helo_restrictions = reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname smtpd_sender_restrictions = reject_non_fdqn_sender Is that safe to do? My current smtpd restrictions are: smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unlisted_recipient, reject_unlisted_sender And my postfix -n, if it helps: config_directory = /etc/postfix home_mailbox = .maildir/ mydestination = localhost $myhostname localhost.$mydomain $mydomain example.net example.com mynetworks = 127.0.0.0/8 myorigin = $mydomain sender_dependent_relayhost_maps = hash:/etc/postfix/sender_relay smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_sender_dependent_authentication = yes smtp_tls_CApath = /etc/ssl/certs smtp_tls_security_level = may smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unlisted_recipient, reject_unlisted_sender smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_type = dovecot smtpd_tls_CAfile = /etc/ssl/postfix/cacert.pem smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/postfix/cert.pem smtpd_tls_key_file = /etc/ssl/postfix/key.pem smtpd_tls_security_level = may Thanks.
