Gmail set's all sent e-mail from my mailserver as spam
Hi all,
I resort to this forum since I am at a loss as to how I can fix this problem. Ill try to explain as best I can: I am running a mailserver for the first time with Postfix+Dovecot, everything is working just fine, including virtual accounts with MySQL support and TLS encryption. However I have come by a problem that I simply have no idea what could be wrong. Basically all email that is sent from my mailserver, to either gmail or hotmail (and I guess more) is always marked as SPAM. I have reviewed my configuration, e-mail headers and googled, yet I am at a loss. Any help would be much appreciated. Below I include an e-mail header (that is marked as spam), postfix configuration and dovecot configurations. BTW: I am running Slackware 11.0 ######################## EMAIL HEADER ################ Delivered-To: MY-EMAIL@gmail.com Received: by 10.70.49.18 with SMTP id w18cs97002wxw; Sat, 2 Dec 2006 11:36:13 -0800 (PST) Received: by 10.66.216.20 with SMTP id o20mr9249936ugg.1165088172800; Sat, 02 Dec 2006 11:36:12 -0800 (PST) Return-Path: <MY-EMAIL@MYDOMAIN.COM> Received: from mail.MYDOMAIN.COM (bl6-192-225.dsl.telepac.pt [82.155.192.225]) by mx.google.com with ESMTP id 54si27407209ugp.2006.12.02.11.36.11; Sat, 02 Dec 2006 11:36:12 -0800 (PST) Received-SPF: pass (google.com: domain of MY-EMAIL@MYDOMAIN.COM designates 82.155.192.225 as permitted sender) Received: from neuronihc (unknown [192.168.1.1]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by mail.MYDOMAIN.COM (Postfix) with ESMTP id A6F26369 for <MY-EMAIL@gmail.com>; Sat, 2 Dec 2006 19:33:54 +0000 (WET) From: "icebrian" <MY-EMAIL@MYDOMAIN.COM> To: <MY-EMAIL@gmail.com> Subject: test Date: Sat, 2 Dec 2006 19:36:03 -0000 Message-ID: <001e01c71649$1ba5c1a0$0a01a8c0@neuronihc> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001F_01C71649.1BA5C1A0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AccWSRox/6Vq2UqnSmyXZRrWIynQDA== X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ################### POSTCONF -n ############## alias_database = hash:/etc/mail/aliases alias_maps = hash:/etc/mail/aliases broken_sasl_auth_clients = yes command_directory = /usr/sbin/ config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix debug_peer_level = 2 html_directory = no mail_owner = postfix mailq_path = /usr/bin/mailq manpage_directory = /usr/man mydomain = MYDOMAIN.COM myhostname = mail.MYDOMAIN.COM myorigin = $myhostname newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = no relay_domains = mysql:/etc/postfix/mysql_relay_domains_maps.cf sample_directory = /etc/postfix sendmail_path = /usr/sbin/sendmail setgid_group = postdrop smtp_sasl_auth_enable = no smtpd_enforce_tls = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_tls_CAfile = /etc/ssl/mailca.pem smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/certs/mail.pem smtpd_tls_key_file = /etc/ssl/private/mail.pem smtpd_tls_loglevel = 1 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom unknown_local_recipient_reject_code = 550 virtual_alias_maps = mysql:/etc/postfix/mysql_virtual_alias_maps.cf virtual_gid_maps = static:102 virtual_mailbox_base = /home/mail virtual_mailbox_domains = mysql:/etc/postfix/mysql_virtual_domains_maps.cf virtual_mailbox_limit = 51200000 virtual_mailbox_maps = mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf virtual_minimum_uid = 1001 virtual_transport = virtual virtual_uid_maps = static:1001 ##################### dovecot -n ########### base_dir: /var/run/dovecot/ log_path: /var/log/dovecot_error.log info_log_path: /var/log/dovecot.log protocols: pop3s ssl_ca_file: /etc/ssl/mailca.pem ssl_cert_file: /etc/ssl/certs/mail.pem ssl_key_file: /etc/ssl/private/mail.pem disable_plaintext_auth: no login_dir: /var/run/dovecot//login login_executable: /usr/libexec/dovecot/pop3-login login_user: dovecotauth login_process_size: 64 verbose_proctitle: yes first_valid_uid: 1001 first_valid_gid: 102 mail_extra_groups: postfix mail_location: maildir:/home/mail/%d/%n mbox_write_locks: fcntl mail_executable: /usr/libexec/dovecot/pop3 mail_plugin_dir: /usr/lib/dovecot/pop3 pop3_uidl_format: %08Xu%08Xv pop3_client_workarounds: outlook-no-nuls oe-ns-eoh namespace: type: private inbox: yes auth default: mechanisms: plain login verbose: yes debug: yes passdb: driver: pam passdb: driver: sql args: /etc/dovecot/dovecot-sql.conf userdb: driver: passwd userdb: driver: sql args: /etc/dovecot/dovecot-sql.conf socket: type: listen client: path: /var/spool/postfix/private/auth mode: 432 user: postfix group: postfix |
If your mail server doesn't have a valid reverse dns, then most emails servers these days are configured to do a reverse lookup of your ip address. If that doesn't match your domain name then it will get tagged as spam.
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Reverse DNS lookup dosent resolve to my domain, but problem is not here.
Firstly thanks for the reply fordeck.
I investigated what you said, and it is true that by preforming a Reverse DNS lookup on my IP, I only get a hostname and the domain of my ISP and not my own domain. However I reconfigured postfix to use both this hostname and domain and the same still happens. As I am using DynDNS services (due to dynamic IP address) I searched their support and found the following: http://www.dyndns.com/support/kb/arc...verse_dns.html Apparently under "Do I need Reverse DNS" they state that it is not necessary that the reverse dns lookup resolve to the domain. It should only resolve to something valid. Due to the fact I have both tried altering my hostname and domain to what my IP resolves to, and, what DynDNS states on their Support web page, I have to conclude that the problem is not here. I am still at a loss :( |
Reverse DNS & Dynamic IP
After e-mailing DynDNS support, I have come to the conclusion that the problem does lay on the fact my IP is both dynamic and does not reverse lookup to my domain.
Guess ill just have to get a static IP, or, use my ISP's SMTP server. |
Performing a simple reverse lookup should validate your domain's existense and thus if it exists, it won't be suspected as being used by spammers since spammers do usually use fake domains or short-lived domains.
The first example shows that it can't resolve to what domain that IP is pointed to. @webmaster:~$ host your.internet.ip.add Host your.internet.ip.add.in-addr.arpa not found: 3(NXDOMAIN) This one next is what should be expected. @webmaster:~$ host your.internet.ip.add your.internet.ip.add.in-addr.arpa domain name pointer your.domain.com. |
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