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[case 59934] [case 59875] cPanel bug/flaw causing CBL issues

Discussion in 'E-mail Discussions' started by bellwood, Jan 3, 2013.

  1. bellwood

    bellwood Member
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    I currently have a ticket open with cPanel support investigating an issue where by 2 bugs in the system are causing our server's main shared IP to become and remain CBL'd.

    The first bug is:
    59875 - user accounts owned by a reseller will reference reseller's domain in /etc/mailhelo (instead of account's domain)

    This is big problem for our resellers customer's who are themselves resellers.

    All their mail ehlo's as their resellers domain and not their own.

    The second bug is:
    59934 - /etc/mail_reverse_dns "incorrect" when multiple users exist on the same IP address

    Whenever a reseller has multiple customers on the same IP, mail is sent from the server's main shared IP instead and ehlo's as the server's hostname. Again bad for our resellers.

    This all add's up to our server looking like it's compromised and sending mail from the shared IP and hostname which is causing lots of headaches for us and our customers and down the chain.

    As ancillary issue, whenever one of our customers creates and account, the notifications come from the servers main shared IP and hostname, not theirs, so if the server is CBL'd they often don't get them AND it reveals our hostname instead of theirs to their clients.

    Again, this has all been conveyed and confirmed via a ticket with cPanel however I'm hoping some additional light and 'spotlight' on the subject may help bring fixes to these obvious problems.

    Thank you =)
     
  2. JeffP.

    JeffP. Well-Known Member

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    If anyone else notices this issue, please submit a ticket (see my signature below for the link to our helpdesk), and be sure to reference the appropriate case ID(s) in the ticket. This will allow us to add the ticket # to the corresponding case(s), which will continue to allow our developers to see the growing need for these issues to be resolved.

    Thanks!
     
  3. bellwood

    bellwood Member
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    Additional issues are now surfacing as well.

    Sender Verify Callbacks are NOT using the clients dedicated IP either, it's using the main servers IP, so since the main IP is CBL'd due to the above, email delivery is GREATLY degraded.

    C'mon cPanel PLEASE address this obvious oversight. Email is a vital service for all clients.
     
  4. alphawolf50

    alphawolf50 Well-Known Member

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    "Sender Verification Callouts" should be disabled, period. "Sender Verification" is fine, it just verifies the domain exists. "Sender Verification Callouts" actually connects to a remote mail server and tries to verify that the account actually exists. This will land you on many blacklists. Disable "Sender Verification Callouts".
     
  5. bellwood

    bellwood Member
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    This was namely an issue for VPS/dedicated clients and we made the same recommendation.
     
  6. brianoz

    brianoz Well-Known Member

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    More detail is listed here: http://forums.cpanel.net/f43/listed-cbl-result-using-send-mail-accounts-dedicated-ip-270432.html

    The point is, cPanel's behaviour is incorrect and is getting people's IPs listed on CBL.

    Without doing detailed analysis, I'm not 100% sure, but I suspect correct behaviour would be to use the same HELO string for all domains sending out of a particular IP. That fix in itself would alleviate the CBL problem.

    Many of us are getting listed, here I am back a year later with the same issue. Could this be looked into further?
     
  7. cPanelMichael

    cPanelMichael Forums Analyst
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    Both internal cases referenced in this thread are still open. There is currently no time frame available on when a resolution may be implemented. I have ensured this thread is referenced in both internal cases so our developers can review your specific concerns.

    Thank you.
     
  8. andrei_claus

    andrei_claus Member

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    Hello,

    We are having the same problem and have opened a cPanel ticket.

    Our reseller IP's get listed monthly.

    I cannot begin to explain the importance of this issue being solved as mail services are an important part of client overall happiness.

    We have come to the stage where CBL is going to block our delisting attempts.

    Please make any efforts you can to solve this.

    have a nice day
     
  9. jack01

    jack01 Well-Known Member

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    Can we have a formal update about this situation? Has 11.40 addressed this problem at all because we are noticing CBL blocks for no apparent reason after updating to WHM 11.40.0 (build 19) - RELEASE (CENTOS 6.4 x86_64).
     
  10. Infopro

    Infopro cPanel Sr. Product Evangelist
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    Twitter:
    This reply stands.

     
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