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There was a SMTP communication problem with the recipient's email server

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  • There was a SMTP communication problem with the recipient's email server

    Hi Experts

    I am aware that this question was asked in many forums as can been seen in the link below :

    http://www.google.com.au/search?clie...=Google+Search

    but I could not find a solution to my problem.

    My client has an Exchange server 2003 SP1. Yesterday all of the sudden they were unable to send emails to some external addresses and they were able to send it to other addresses
    they are okay for receiving email from external addresses and internally with out any problem.

    I did test by my self I sent an email from my client domain to my gmail account I did receive that but I did receive nothing when I sent a test email to my yahoo and my work account .

    The only error that I have received when I sent an email from my client domain to my hotmail account is this :

    The following recipient(s) could not be reached:
    [email protected] on 16/06/2010 10:15 PM
    There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
    <mail.fake.org.in #5.5.0 smtp;550 OU-001 Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit http://postmaster.live.com for email delivery information and support>
    If the problem was only with the hotmail account then I would have posted my my question to the windowslivehelp.com forum, as this guy did

    http://windowslivehelp.com/thread.as...e-a070e5f959fd



    my client ISP provider and his webhosting provider are two different companies.

    Email client is outlook 2003

    When I checked the ip address for the router (static ip address for WAN) i found it listed 5 out 150 as can been seen in the snapshot below :

    Code:
     http://mxtoolbox.com/blacklists.aspx
    http://tinypic.com/r/2gy2jw6/6





    Code:
    http://rbls.org
    http://tinypic.com/r/2emiwih/6



    But when I checked " mail.fake.org.in " -means not the ip address- it is also black listed in mxtoolbox.com but it is not blacklisted in rbls.org!!!!!

    Thanks

  • #2
    Re: There was a SMTP communication problem with the recipient's email server

    As you already found out, it is somewhat related to anti-spam solutions.

    You have to find out why you are on some blacklists and stop the action which brought you on the list.

    The reason why some mails are delivered and some not is mostlikely the level of anti-spam protection and the sources used at the recipient side, also receiving mails is complete independant from sending in that case.

    Comment


    • #3
      Re: There was a SMTP communication problem with the recipient's email server

      Hotmail operate their own blacklist.
      Back scatter means you don't have recipient filtering enabled, which you should do, unless you are on Windows 2000 then you need to use a third party tool to do recipient validation.

      The other blacklists should give you information on why you are listed. However it doesn't happen in error.

      I have a blog posting on what is probably going on.
      http://blog.sembee.co.uk/post/One-mo...isted-etc.aspx

      Most likely, you have a compromised workstation.

      Simon.
      --
      Simon Butler
      Exchange MVP

      Blog: http://blog.sembee.co.uk/
      More Exchange Content: http://exchange.sembee.info/
      Exchange Resources List: http://exbpa.com/
      In the UK? Hire me: http://www.sembee.co.uk/

      Sembee is a registered trademark, used here with permission.

      Comment

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