Forum Discussion

sobwom's avatar
New Contributor
9 months ago

Extreme incoming email delay or undeliverable

I am seeing 10-20 hours delay in receiving TFA emails, or not receiving them at all, from and delivery failure due to taking over 24 hours for emails from

How can I get this fixed?

6 Replies

Replies have been turned off for this discussion
  • sobwom's avatar
    New Contributor

    For example, I got the following at 10:02 AM MST today (2023-08-12):

    Diagnostic information for administrators:

    Generating server:
    Total retry attempts: 15

    Remote server returned '550 5.4.300 Message expired -> 451 4.2.0 AUP#??'

    Original message headers:

    Received: from (2603:10b6:8:97::5) by (2603:10b6:8:79::6) with Microsoft  SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id  15.20.6678.22; Sat, 12 Aug 2023 05:03:32 +0000
    ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901;; cv=none;  b=BA83jxhGb9b3SuenARBe2INGke2xPpUaWbRUbQVWi7fc4dGS/LNEX4817Th9m1oZXGcg/KsR05LgpmHQLKsvbmLZIGykyd7CJRHz/5cf9RKQwh75vkrpPJkYkmPDo0bhCRXa7Byk+WLfDYkx8+aubu7MNC9Upkod4cxlJqIBgFyuK2AyIvOpny0Cyp/a427TAxIDZP7z28pfu4B5i3Ci+Q7PTexuhi+P1VreESolpABqP2QYIpD0nwjJx7fupGu1xYhTmSjupjezxLfHqHhfe++h6enXnK0qPGkfr4BhqmXX/kjhIShAH8sRVnUGUxfiioPyB5fhp6n+GInAtlmHxQ==
    ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed;;  s=arcselector9901;  h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1;
    ARC-Authentication-Results: i=1; 1; spf=pass; dmarc=pass action=none;  dkim=pass; arc=none
    DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;;  s=selector1;  h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;
    Received: from (2603:10b6:a03:b4::26)  by (2603:10b6:8:97::5) with Microsoft  SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id  15.20.6652.30; Fri, 11 Aug 2023 17:01:27 +0000
    Received: from
     ([fe80::95fc:e3b0:22d7:a686]) by
     ([fe80::95fc:e3b0:22d7:a686%4]) with mapi id 15.20.6652.029; Fri, 11 Aug 2023
     17:01:27 +0000
    From: <>
    To:  <>
    Date: Fri, 11 Aug 2023 17:01:27 +0000

  • WiderMouthOpen's avatar
    Esteemed Contributor

    From here;

    If you are having problems with email delivery send us an email at for assistance. Your email must contain all of the following information in order for us to process your request.

    First name
    Last name
    Email address
    Phone number
    IP/CIDR range of outgoing email servers

    From the following choices, indicate the item that best describes the issue you are experiencing.
    My IP address is being blocked
    My domain is being blocked
    My email is being marked as spam
    My email is not arriving to the intended recipients
    My email is being delayed

    Include a detailed description of the issue you are experiencing, such as the date and time when the problem began and the corrective action that has been taken.

    Include email server logs related to the issues.

    • sobwom's avatar
      New Contributor

      Sender or Recipient 'email address'? 

      And since I do not run the servers, how should I know/find out the 'IP/CIDR range of outgoing email servers'?

      • lhn_fan's avatar
        New Contributor III

        Just refer them to your post or include the text of the rejection email in your response.  I'm thinking that should tell them everything they need to know to address the problem.

  • lhn_fan's avatar
    New Contributor III

    I'm seeing the same problem with mail my spouse is sending to me.  Different Exchange server, but the same error message.  Most messages don't go through, and the few that do take 20+ hours for a simple message with no attachments.