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bounced mails, please help

Discussion in 'E-mail Discussions' started by Secret Agent, Jun 16, 2005.

  1. Secret Agent

    Secret Agent Guest

    I have been receiving messages as quoted below when sending mail through the server. Sometimes they are just text messages to one domain, sometimes when I send a group mail they are for all domains. It seems to make no difference whether there is an attachment or not. It also seems sporadic - I can send 3 or 4 messages with no problems then the next several bounce. here is a sample:

    Subject: Mail delivery failed: returning message to sender
    Date: June 7, 2005 5:32:39 AM CDT
    Return-Path: <>
    Delivery-Date: Tue, 07 Jun 2005 06:32:40 -0400
    Received: from techie3 by with local-bsmtp (Exim 4.50) id 1DfbNv-0001ZB-Ln for; Tue, 07 Jun 2005 06:32:40 -0400
    Received: from mailnull by with local (Exim 4.50) id 1DfbNv-0001Z7-Jd for; Tue, 07 Jun 2005 06:32:39 -0400
    Auto-Submitted: auto-generated
    Message-Id: <>
    X-Spam-Checker-Version: SpamAssassin 3.0.3 (2005-04-27) on
    X-Spam-Status: No, score=-1.2 required=5.0 tests=ALL_TRUSTED,AWL,UNIQUE_WORDS, UPPERCASE_25_50 autolearn=ham version=3.0.3

    This message was created automatically by mail delivery software.

    A message that you sent could not be delivered to one or more of its
    recipients. This is a permanent error. The following address(es) failed:
    unrouteable mail domain ""

    ------ This is a copy of the message, including all the headers. ------

    Return-path: <>
    Received: from ([] helo=[])
    by with esmtpa (Exim 4.50)
    id 1DfbNq-0001YH-0I
    for; Tue, 07 Jun 2005 06:32:39 -0400
    Mime-Version: 1.0 (Apple Message framework v730)
    Message-Id: <>
    Content-Type: multipart/mixed; boundary=Apple-Mail-2-246708033
    From: "R. J. Mike Nielsen" <>
    Subject: Proof
    Date: Tue, 7 Jun 2005 05:32:25 -0500
    X-Mailer: Apple Mail (2.730)


    I'm getting this from a lot of clients:

    The recipient cannot be verified. Please check all recipients of this
    550 message to verify they are valid

    How do I stop this? My install procedure is below

    mv exim_deny.txt /etc/
    touch /etc/exim_deny
    chown mailnull:mail /etc/exim_deny /etc/
    chmod 700 /etc/
    chmod 600 /etc/exim_deny

    Exim Configuration Editor > Switch to Advanced Mode
    Find in second text box:

    accept hosts = :

    So, including that line it should look like:

    drop hosts = /etc/exim_deny
    message = Connection denied after dictionary attack
    log_message = Connection denied from $sender_host_address after dictionary attack

    drop message = Appears to be a dictionary attack
    log_message = Dictionary attack (after $rcpt_fail_count failures)
    condition = ${if > {${eval:$rcpt_fail_count}}{3}{yes}{no}}
    condition = ${run{/etc/ $sender_host_address }{yes}{no}}
    !verify = recipient

    ln -s /etc/ /etc/cron.hourly/


    My setup:

    cpanel 10.2x CURRENT
    default catch all = fail
    inlude list of pop before smtp senders... ON
    Silently Discard all FormMail-clone requests with a bcc: header in the subject line... ON
    track origin of messages sent through mail servrer... OFF
    prevent user nobody... OFF
    max emails domain can send per hour.....100

    EXIM config:
    Always set the Sender: OFF
    verify the existance of email senders ON
    discard emails..... ON


    /scripts/exim4 --force (v4.5x)

    Any suggestions?

    I also have EXIM ACL dictionary attack installed as well

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