Hello Postfix User List, I have a mail server that I use to provide a smart host service for my customers. I have a problem sending a message onto a recipient in the domain cbhc.uk.com. The failure message is below.
I'm struggling to work out why postfix is unable to forward this message when there is a valid MX record. The error states that there is no A record for the domain name (which is correct) but I would have thought Postfix should be looking for an MX record as well. I have checked /var/spool/postfix/etc/resolv.conf and confirmed that this contains valid DNS servers (8.8.8.8 and 8.8.4.4) and have confirmed that I am able to query for MX records (using dig) and I get correct results - I have also tested telnet on port 25 to each MX and confirmed I can connect. I have replaced any potentially sensitive data in the mail log entry whit HIDDEN - I hope this doesn't hamper any efforts to help. Any help would be greatly appreciated. Mail log entry: Jan 16 10:59:52 smtp postfix/smtpd[21012]: B905D39A041E: client=HIDDEN, sasl_method=LOGIN, sasl_username=HIDDEN Jan 16 10:59:52 smtp postfix/cleanup[21008]: B905D39A041E: message-id=<744A7ED15EAB1447B0011004ED33376501296912@HIDDEN> Jan 16 10:59:53 smtp postfix/qmgr[298]: B905D39A041E: from=<HIDDEN>, size=161277, nrcpt=2 (queue active) Jan 16 10:59:53 smtp postfix/smtp[21010]: B905D39A041E: to=<hid...@cbhc.uk.com>, relay=none, delay=1.2, delays=1.2/0/0.05/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=cbhc.uk.com type=A: Host not found) Jan 16 10:59:53 smtp postfix/smtp[21010]: B905D39A041E: to=<hid...@cbhc.uk.com>, relay=none, delay=1.2, delays=1.2/0/0.05/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=cbhc.uk.com type=A: Host not found) Jan 16 10:59:53 smtp postfix/bounce[21013]: B905D39A041E: sender non-delivery notification: F185D51A005F Jan 16 10:59:53 smtp postfix/qmgr[298]: B905D39A041E: removed Postconf -n Output: config_directory = /etc/postfix delay_warning_time = 4h disable_vrfy_command = yes local_recipient_maps = local_transport = error:local mail delivery is disabled mail_name = Ontraq message_size_limit = 20480000 mydestination = myhostname = smtp.ontraq.com mynetworks = myorigin = ontraq.com smtpd_recipient_restrictions = permit_sasl_authenticated reject smtpd_sasl_auth_enable = yes smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous noplaintext smtpd_sasl_tls_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sender_login_maps = hash:/etc/postfix/relay_domains smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access reject_sender_login_mismatch smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/postfix/smtp.ontraq.com.pem smtpd_tls_key_file = /etc/postfix/smtp.ontraq.com.key smtpd_tls_loglevel = 0 smtpd_tls_security_level = encrypt Kind regards, James Day
