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  1. #1

    SMTP error "MTA's poor reputation."

    Hi,
    Some of my clients receive mail delivery errors when sending messages to some domains, following is the error about "MTA's poor reputation." :
    ---------------------------------------------------------------------------
    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:

    xxxx@xxxx.com
    SMTP error from remote mail server after initial connection:
    host mail2.xxxx.com [1xx.1xx.1x9.1x]: 554-mail2.xxxx.com
    554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
    ---------------------------------------------------------------------------
    Thank you

  2. #2
    http://mxtoolbox.com/ will show you the websites where your server IP is blacklisted. You will have to contact them and ask them to remove your IP from their black list.

    They may ask you to make some changes on your server to avoid these in future, so you will have to make those changes.
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  3. #3
    Join Date
    Jun 2006
    Location
    Europe
    Posts
    632
    looks like ironport, check your mailserver ip address at senderbase.org

  4. #4
    Join Date
    Nov 2009
    Location
    Nasik,India
    Posts
    252
    Hello,

    you can check your mail server ip with network-tools.com
    So after that you can do tracert then you will get detailed report do u can tell this thing to your ISP.
    <<< Please see Forum Guidelines for signature setup. >>>

  5. #5
    Join Date
    Feb 2010
    Location
    Ohio, USA
    Posts
    120
    Hate to ask, but is your server doing anything to earn a bad rep? Any of your clients using it to send things they shouldnt?

    Personally, If i were in this situation, I would start by doing 2 things:
    Review the mailservers logs. this can often be enlightening.
    Communicate with the domain that is rejecting your mail. A lot of webmail providers and ISPs etc will let you sign up for a feedback loop, so that if one of their customers reports an email your server sent as spam, you find out about it immediately.

    That of course has a few advantages. ISP is more likely to accept your mail if they know they can yell at you if there is a problem. More importantly, if a client of yours is doing something less than legit, you are likely to find out much faster, before this kind of crap ever has a chance to reoccur.

    Was the recipient domain aol by chance? It sounds like one of their bounce messages. If it is, then yeah they are insanely strict with IP reputation, but ironically very easy to work with once you contact their postmaster site.

    Hope this helps.

  6. #6
    Join Date
    Nov 2003
    Location
    Earth
    Posts
    270
    also look at senderbase.org and spamcop.net
    "An army of sheep led by a lion would defeat an army of lions led by a sheep"

  7. #7
    Join Date
    Aug 2006
    Location
    Ashburn VA, San Diego CA
    Posts
    4,469
    senderbase.org is where you want to look. Chances are, your server is either brand new or misconfigured. If it's configured correctly, you will be upgraded to neutral or good after a month or two as long as no spammers are on your same IP block.
    Fast Serv Networks, LLC | AS29889 | Fully Managed Cloud, Streaming, Dedicated Servers, Colo by-the-U
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  8. #8
    Join Date
    Jun 2006
    Location
    Europe
    Posts
    632
    takes about a week to get from "Poor" to "Neutral" on senderbase/ironport, but only if the mailserver ip address is really legit and is not listed on any other RBL's.

  9. #9
    Hi,
    Thank you all, Yes my server is brand new, checking on :

    1- mxtoolbox.com gives this error: ==> mx requires a Fully Qualified Domain Name and xx.xx.xx.xxx is not a valid FQDN.

    2- senderbase.org :==> SenderBase reputation score" Poor "

    3- spamcop.net ==> not listed

    What should I do??

  10. #10
    Join Date
    Oct 2007
    Location
    Reading, UK
    Posts
    601
    Hi,

    1) this appears to be an issue with your domain, but unless you tell us the domain that you actually are using, we can't really help you here.
    2) Have you checked other spam lists such as http://www.spamhaus.org/
    You can check many lists here: http://www.webmaster-toolkit.com/spa...-checker.shtml
    Toby H
    Infrastructure Consultant
    SolutionFire.co.uk
    cPanel | VMware | XenServer | cPanel | 3PAR | R1soft

  11. #11
    Hi,
    Rechecking again on "mxtoolbox.com" I got the results:

    May be an open relay.
    0 seconds - Good on Connection time
    0.452 seconds - Good on Transaction time
    OK - Reverse DNS matches SMTP Banner

    How to correct this open relay?? I have a centos/cpanel server with Exim.
    Thank you

  12. #12
    Join Date
    Oct 2007
    Location
    Reading, UK
    Posts
    601
    Hi,

    You should have this enabled:
    WHM >> Security Center >> SMTP Tweak

    As far as I know cPanel ships with a closed relay server.
    You can run a few commands via SSH to be sure.

    /scripts/fixrelayd
    /etc/rc.d/init.d/antirelayd restart
    service exim restart
    Toby H
    Infrastructure Consultant
    SolutionFire.co.uk
    cPanel | VMware | XenServer | cPanel | 3PAR | R1soft

  13. #13
    Join Date
    Feb 2010
    Location
    Ohio, USA
    Posts
    120
    Quote Originally Posted by anastasia0181 View Post
    Hi,
    Rechecking again on "mxtoolbox.com" I got the results:

    May be an open relay.
    0 seconds - Good on Connection time
    0.452 seconds - Good on Transaction time
    OK - Reverse DNS matches SMTP Banner

    How to correct this open relay?? I have a centos/cpanel server with Exim.
    Thank you
    Does your mailserver require authentication to send, and will it send from just any domain, or only the ones you specify?

    If the answer is I dont know, to either of those, then you have a blacklisting waiting to happen.

    Also, as I mentioned before, you should consider opening a feedback loop with as many ISP's and webmail providers as possible. Since spammers like to target such recipients, having that feedback loop is one of the fastest ways you can find out if someone is abusing your server.

    Feedback loops are easy to set up, and certainly easier than clearing up a situation later down the road if you get blacklisted.

    If all else fails, take the server offline until you *know* its fixed.

    Hope this helps

  14. #14

    MTA poor reputation - Please help

    Hi,

    I contacted senderbase.org and they said that one of my accounts was sending spam and in order to unblock my IP they asked me to send an email indicating what steps are being taken to mitigate spam from being sent from my IPs.
    Please help.

    Thank you

  15. #15
    Join Date
    Feb 2010
    Location
    Ohio, USA
    Posts
    120
    Have you corrected the open relay issue you mentioned earlier? Have you looked over your mail server's logs and located how and why someone was able to use it to spam, or if it was a previous user of the IP space.

    If yes to both, tell them this, specifying what you did.
    If no, you might want to do so asap, or if needed, hire someone to do so.

    This type of problem will get worse, not better, if left not fixed.

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