+ Post New Thread
Results 1 to 13 of 13
Windows Server 2000/2003 Thread, Unsolicited Bulk Email abuse - Exchange 2003 in Technical; We have sudenly lost the ability to send external e-mails! Eveything has been fine for months and nothing has changed ...
  1. #1
    rob998's Avatar
    Join Date
    Jun 2005
    Posts
    154
    Thank Post
    34
    Thanked 22 Times in 8 Posts
    Rep Power
    24

    Unsolicited Bulk Email abuse - Exchange 2003

    We have sudenly lost the ability to send external e-mails! Eveything has been fine for months and nothing has changed on the exchange server. Then last night e-mails I was sending were getting returned with the following message:

    Your message did not reach some or all of the intended recipients.

    Subject:
    Sent: 31/03/2010 9:14 AM

    The following recipient(s) could not be reached:

    **name**@domain.com on 31/03/2010 9:14 AM
    There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
    <**server-address**.internal #5.5.0 smtp;550-Your server is a current source of Unsolicited Bulk Email abuse. Please>

    The above was just a test but it happens with any external address and any user.

    I have used a website called MX Lookup Tool - Check your DNS MX Records online - MxToolbox to check if we are on a blacklist but we are not on any of them.

    I have logged a call with our ISP about this but if you guys have any suggestions I would be greatful.

  2. #2
    dwhyte85's Avatar
    Join Date
    Mar 2009
    Location
    Berkshire
    Posts
    1,235
    Thank Post
    162
    Thanked 153 Times in 138 Posts
    Rep Power
    104
    Was this for every e-mail or just to a specific recipient?

  3. #3
    rob998's Avatar
    Join Date
    Jun 2005
    Posts
    154
    Thank Post
    34
    Thanked 22 Times in 8 Posts
    Rep Power
    24
    I have tried a few recipients:

    *@hotmail.com
    *@ntlworld.com
    *@lea.sch.uk

    All have come back with the same reply. I have done this using several user accounts :-(

  4. #4

    AngryTechnician's Avatar
    Join Date
    Oct 2008
    Posts
    3,730
    Thank Post
    698
    Thanked 1,214 Times in 761 Posts
    Rep Power
    395
    Are you on a fixed IP, not dynamic? It's unlikely you would be on a dynamic address, but if your IP has changed recently you may have inherited one used by spammers in the past.

    Have you double checked your relay authentication is working correctly for external connections?

    It also is not impossible that another of your ISP's customers has caused a portion of their netblock to be banned and you're part of it. This is up to the ISP to resolve so raising it with them is the right approach. If your ISP's own SMTP server has not been blocked you could configure your Exchange server to route through that as a smart host temporarily.
    Last edited by AngryTechnician; 31st March 2010 at 11:43 AM.

  5. #5
    rob998's Avatar
    Join Date
    Jun 2005
    Posts
    154
    Thank Post
    34
    Thanked 22 Times in 8 Posts
    Rep Power
    24
    HELO please-read-policy.mxtoolbox.com
    250 **server-name**.internal Hello [64.20.227.133] [156 ms]
    MAIL FROM: <supertool@mxtoolbox.com>
    250 2.1.0 supertool@mxtoolbox.com....Sender OK [140 ms]
    RCPT TO: <test@example.com>
    550 5.7.1 Unable to relay for test@example.com [140 ms]
    QUIT
    221 2.0.0 **server-name**.internal Service closing transmission channel [140 ms]

    That is the result of a relay test from mxtoolbox.com

    We are routed through our ISPs Smart Host. ISP are looking into it but I don't think any IP adresses have changed otherwise we would be able to receieve inbound mail.

    It happened around 8pm last night, nothing changed on my server so something external is to blame here i'm thinking!

  6. #6
    pwds's Avatar
    Join Date
    Dec 2008
    Location
    Derby
    Posts
    279
    Thank Post
    73
    Thanked 48 Times in 38 Posts
    Rep Power
    21
    If you're using a smart host I'd be looking at another customer of that ISP as the culprit for sending spam- probably due to a compromised server.

    Of course not being the ISP I'd actually be asking the ISP to look at that.

    Can you fall back on to directly relaying mail for the time being until your ISP gets their act together?

  7. #7
    rob998's Avatar
    Join Date
    Jun 2005
    Posts
    154
    Thank Post
    34
    Thanked 22 Times in 8 Posts
    Rep Power
    24
    Turns out our ISP had put a manual block on our IP using their Smart Host. Not sure what the reason is for doing that. Hopefully I should be back up and running today.

    Rob

  8. #8
    rob998's Avatar
    Join Date
    Jun 2005
    Posts
    154
    Thank Post
    34
    Thanked 22 Times in 8 Posts
    Rep Power
    24
    Working now

  9. #9


    Join Date
    Feb 2007
    Location
    Northamptonshire
    Posts
    4,706
    Thank Post
    354
    Thanked 807 Times in 722 Posts
    Rep Power
    348
    Quote Originally Posted by rob998 View Post
    Turns out our ISP had put a manual block on our IP using their Smart Host. Not sure what the reason is for doing that. Hopefully I should be back up and running today.

    Rob
    "Manual Block" - Did they not think to yanno, inform you of this?

  10. #10
    pwds's Avatar
    Join Date
    Dec 2008
    Location
    Derby
    Posts
    279
    Thank Post
    73
    Thanked 48 Times in 38 Posts
    Rep Power
    21
    Was a reason given? Have you run a open relay check against your server?

  11. #11
    MxToolBox's Avatar
    Join Date
    Apr 2010
    Location
    Austin, TX
    Posts
    2
    Thank Post
    0
    Thanked 1 Time in 1 Post
    Rep Power
    0
    Thanks for recommending our DNS tools, we are always interested to see what other tools you are using in conjunction with ours.

    Let us know if you think our website is missing any tools and we will look at adding them.

    Thank you,
    @MxToolBox

  12. Thanks to MxToolBox from:

    kmount (1st April 2010)

  13. #12


    Join Date
    Feb 2007
    Location
    Northamptonshire
    Posts
    4,706
    Thank Post
    354
    Thanked 807 Times in 722 Posts
    Rep Power
    348
    Quote Originally Posted by MxToolBox View Post
    Thanks for recommending our DNS tools, we are always interested to see what other tools you are using in conjunction with ours.

    Let us know if you think our website is missing any tools and we will look at adding them.

    Thank you,
    @MxToolBox
    Welcome to Edugeek,

    Your site has no doubt helped many other people (myself included) over the years, please stick around as no doubt your knowledge will be helpful to people on here.

    Thanks

    Kim

  14. #13
    MxToolBox's Avatar
    Join Date
    Apr 2010
    Location
    Austin, TX
    Posts
    2
    Thank Post
    0
    Thanked 1 Time in 1 Post
    Rep Power
    0
    Quote Originally Posted by kmount View Post
    Welcome to Edugeek,

    Your site has no doubt helped many other people (myself included) over the years, please stick around as no doubt your knowledge will be helpful to people on here.

    Thanks

    Kim
    Thanks so much! We will definitely be chiming in time and again.

    Thanks,
    @MxToolBox



SHARE:
+ Post New Thread

Similar Threads

  1. Bulk Import Contacts into Exchange 2003
    By TheFopp in forum Windows
    Replies: 4
    Last Post: 6th May 2010, 08:01 PM
  2. Replies: 6
    Last Post: 30th January 2009, 03:23 PM
  3. Unsolicited email
    By browolf in forum School ICT Policies
    Replies: 1
    Last Post: 6th November 2008, 02:13 PM
  4. Tracking email abuse
    By blackcat in forum How do you do....it?
    Replies: 2
    Last Post: 21st August 2007, 01:02 PM
  5. Email Disclaimers - Exchange 2003
    By timbo343 in forum Windows
    Replies: 4
    Last Post: 9th May 2007, 03:58 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •