SMTP 550 - Sender not allowed

From: Dave Woolley (dvwool_at_ix.netcom.com)
Date: 06/17/04

  • Next message: Casey Hay: "Re: URGENT!!!! Uninstalled and re-installed SMTP service on SBS 2000 machine... HELP!" 
    Date: 17 Jun 2004 13:06:49 -0700

    Hello,

    I'm trying to figure out a sporadic e-mail problem that has been
    occurring for us for a few months now. Here's our setup...

    - one Exchange 2000 server
    - single AD domain environment
    - e-mail routed through Internet T1 by default
    - Exchange is configured to route e-mail to some specific domains
    through a backend T1... a partner has a WorldSecure server that acts
    as a mail hub for all of those domains.

    About 25% of the time, sending e-mail to one of the "specially-routed"
    domains results in the undeliverable message at the end of my post.
    I've done some testing and the problem doesn't seem to be related to
    time of day, content, or length of message. In researching newsgroup
    postings, I read about reverse DNS being a possible issue, but I'm
    sure that reverse DNS is set up properly for us.

    Something that dawned on me... the partner that acts as the mail hub
    switched us from a frame relay to a T1-VPN around the time that the
    problems started occurring... is it possible that it's a problem with
    the access list on their new router or something like that?

    Any thoughts would be much appreciated.
    Thanks!
    -Dave

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

          Subject: Test
          Sent: 6/10/2004 12:49 PM

    The following recipient(s) could not be reached:

          'user@otherdomain.com' on 6/10/2004 12:49 PM
                There was a SMTP communication problem with the
    recipient's email server. Please contact your system administrator.
                <mailserver.mydomain.com #5.5.0 smtp;550 Requested action
    not taken - Sender not allowed>
    ===================================================================

  • Next message: Casey Hay: "Re: URGENT!!!! Uninstalled and re-installed SMTP service on SBS 2000 machine... HELP!"

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