Hi, I am having a problem with one particular domain where they don't appear to have n mx record but I know they exist(one of our biggest customers) and the log file gives me - Dec 1 10:35:58 promotheus postfix/smtp[21508]: 344A7E80B8: domain.com >, relay=none, delay=0, status=bounced ([domain]: Name or service not known) domain.com a dummy entry for what it actually in the log My main.cf looks like this: # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases #mynetworks=192.168.0.0/251 mailbox_command = mailbox_size_limit = 0 recipient_delimiter = + smtpd_sasl_local_domain = smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,rejec t_unauth_destination smtpd_tls_auth_only = no smtp_use_tls = yes smtpd_use_tls = yes smtp_tls_note_starttls_offer = yes smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom home_mailbox = Maildir/ virtual_maps = hash:/etc/postfix/virtusertable mydestination = /etc/postfix/local-host-names smtpd_client_restrictions = permit_mynetworks, reject_rbl_client relays.ordb.org , reject_rbl_client sbl.spamhaus.org,permit message_size_limit = 100000000 maximal_queue_lifetime = 1d The email appears to be going to everyone else fine just this customer Any help much appreciated, my ears getting a bashing. Thanks
Hi, Just found out the customer's dns has a problem, does my main.cf look ok? been getting a lot of spam recently. Thanks again Keith
main.cf is ok, however I recommand you run Code: postconf -e 'mynetworks = 127.0.0.0/8' /etc/init.d/postfix restart to avoid that you have an open relay.
falko, Thanks for the reply, all the clients have internal ips like 192.168.0, would I still use 127.0.0.0/8?. Is there anyway I can configure outgoing mail to only come from these ips? Thanks again Keith
Everyone using an email client must enable "Server requires authentication." in the email client, then they can send emails.
