Results 1 to 5 of 5
  1. #1
    Join Date
    Apr 2003
    Location
    San Francisco, CA
    Posts
    428

    Question YAHOO Spam Block

    Ok...

    One of my customers had :fail: no such address set up as their default address. Some SPAMMER decided to bomb his domain with every possible [email protected]_domain.name This caused hundreds of failed address messages to return to sender. The senders were all phony yahoo addressess...

    No I am getting this from some servers:

    host mx1.mail.yahoo.com [64.156.215.5]: 421 VS5-MF Excessive unknown recipients - possible Open Relay http://help.yahoo.com/help/us/mail/spam/spam-18.html (#4.4.5)


    Problem also is that page does not exists

    This one was totally useless:
    http://help.yahoo.com/help/us/mail/defer/defer-01.html

    I love it, if you have several web servers, you are supposed to watch your logs for too many yahoo bounces, what world do they live in?
    Just curious if anyone had this before. AOL is a dream to deal with compared...l
    Hostito, Inc. - Web Hosting & Reseller Plans
    http://www.hostito.com
    [email protected] - 1 888 467 8486

  2. #2
    Join Date
    Apr 2003
    Location
    Melbourne, AU
    Posts
    539
    doesn't your mailserver just reject the mail outright, after RCPT TO: ? or does it accept the (spoofed) email, then send out bounces?

  3. #3
    Join Date
    Apr 2003
    Location
    San Francisco, CA
    Posts
    428
    Well that is what is weird, it should reject invalid emails, and I am not sure why those were showing as existing if they did not... The server logs show all the server is rejecting invalid emails...

    Very strange, and I am not sure what to make of it In either case I am hoping that they will want to work this out with me. Every customer I ever had that had to deal with yahoo support has gone through hell, or so they tell me. I fear the same is about to begin but for me
    Hostito, Inc. - Web Hosting & Reseller Plans
    http://www.hostito.com
    [email protected] - 1 888 467 8486

  4. #4
    Join Date
    Mar 2004
    Location
    Chicago, IL
    Posts
    384
    Exim in a cPanel system, since it allows "catch-all" and lets the user configure whether to fail or blackhole the mail, accepts the mail before determining what do with it, as long as the domain exists on that machine. (Exim might do this in general, too, but I don't generally use it, so not as familiar with it). It's why I generally recommend :blackhole: instead of :fail: in almost all cases.

    It's a risk you run with any mail system that does this, since sendors can so easily be spoofed.

  5. #5
    Join Date
    Apr 2003
    Location
    San Francisco, CA
    Posts
    428
    yes, I am notifying my customers about this blackhole is my fav.

    No one knows the quickest way to work this out with yahoo do they? I can contact AOL pretty fast (got postmaster phone number), but yahoo, I can't find too much.
    Hostito, Inc. - Web Hosting & Reseller Plans
    http://www.hostito.com
    [email protected] - 1 888 467 8486

Posting Permissions

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