All mail i get sent to my mail account gets this error message and this is the hadshake between the foreign client and my smtp : Code: Out: 220 mymail.server ESMTP Postfix (Free/OS) In: EHLO www.someotherserver Out: 250-mail.myserver Out: 250-PIPELINING Out: 250-SIZE 10240000 Out: 250-ETRN Out: 250-STARTTLS Out: 250-AUTH PLAIN LOGIN Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250 DSN In: STARTTLS Out: 220 2.0.0 Ready to start TLS In: EHLO www.someotherserver Out: 250-mail.myserver Out: 250-PIPELINING Out: 250-SIZE 10240000 Out: 250-ETRN Out: 250-AUTH PLAIN LOGIN Out: 250-ENHANCEDSTATUSCODES Out: 250-8BITMIME Out: 250 DSN In: MAIL FROM:<aha-bounces@someother> SIZE=3945 Out: 250 2.1.0 Ok In: RCPT TO:<gabrix@mydomain> Out: 451 4.3.5 Server configuration error In: DATA Out: 554 5.5.1 Error: no valid recipients In: RSET Out: 250 2.0.0 Ok In: QUIT Out: 221 2.0.0 Bye What can be due ? this is my postconf -n Code: alias_database = hash:/etc/postfix/aliases alias_maps = hash:/etc/aliases append_at_myorigin = yes append_dot_mydomain = no biff = no body_checks = pcre:/etc/postfix/body_checks.txt command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/lib/postfix debug_peer_level = 2 debug_peer_list = $mydomain delay_warning_time = 4h disable_dns_lookups = yes disable_vrfy_command = yes header_checks = pcre:/etc/postfix/header_checks.txt home_mailbox = Maildir/ html_directory = no inet_interfaces = all inet_protocols = all local_transport = local mail_owner = postfix mailbox_command = mailbox_size_limit = 0 mailq_path = /usr/bin/mailq manpage_directory = /usr/local/man mydestination = $mydomain, mail.$mydomain, smtp.$mydomain , pop.$mydomain ,www.$mydomain , ns2.$mydomain , remailer.$mydomain,mix.remailer.$mydomain, localhost.$mydomain, localhost mydomain = gabrix.ath.cx myhostname = mail.$mydomain mynetworks = 127.0.0.0/8 , 10.0.0.0/8 myorigin = $mydomain newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = no recipient_delimiter = + relay_domains = hash:/etc/postfix/relay_domains relayhost = smtp.autistici.org setgid_group = postdrop smtp_cname_overrides_servername = no smtp_enforce_tls = no smtp_sasl_auth_enable = yes smtp_sasl_mechanism_filter = plain,login smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_tls_CAfile = /etc/postfix/ssl/cacert.pem smtp_tls_cert_file = /etc/postfix/ssl/cert.pem smtp_tls_enforce_peername = no smtp_tls_key_file = /etc/postfix/ssl/key.pem smtp_tls_loglevel = 2 smtp_tls_note_starttls_offer = no smtp_tls_security_level = may smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Free/OS) smtpd_enforce_tls = no smtpd_helo_required = no smtpd_recipient_restrictions = permit_mynetworks,check_recipient_access /etc/postfix/client_access.txt,reject_unauth_destination,reject_rbl_client list.dsbl.org,reject_rbl_client zen.spamhaus.org,permit smtpd_reject_unlisted_sender = no smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $mydomain smtpd_starttls_timeout = 4000s smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem smtpd_tls_always_issue_session_ids = no smtpd_tls_ask_ccert = no smtpd_tls_auth_only = no smtpd_tls_cert_file = /etc/postfix/ssl/cert.pem smtpd_tls_key_file = /etc/postfix/ssl/key.pem smtpd_tls_received_header = yes smtpd_tls_req_ccert = no smtpd_tls_security_level = may smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache smtpd_use_tls = yes strict_8bitmime = no strict_rfc821_envelopes = no tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport Maybe i have to see in the maps i configured but sending is ok but i keep on having as delivery mail from any sort of domain with that : Code: Out: 554 5.5.1 Error: no valid recipients If you need more infos just ask , thanks !