bounce error : message has lines too long for transport

Anonymous
2022-04-05T12:14:28+00:00

Hi

I am using outlook 2021, recently many of my emails rejected, and I am getting the below massage regardless to whom i sending to (some pass without any issue)

Quote

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

  **information removed due to privacy policy**

    message has lines too long for transport

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report shows

Quote

X-Mailer: Microsoft Outlook 16.0

Thread-Index: **information removed due to privacy policy**

Content-Language: ar-jo

X-Exim-DSN-Information: Due to administrative limits only headers are returned

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Outlook | Windows | Classic Outlook for Windows | For business

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2024-11-25T18:49:09+00:00

    Thanks, I've lodged the ticket with my host (Heart Internet), will let everyone know how it goes.

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  2. Anonymous
    2024-11-25T18:34:10+00:00

    Hi,

    Please follow this screenshot https://drive.google.com/file/d/1c1ufsHjdKnuyOW70BdaYTsm9bKwNSq5l/view?usp=drivesdk  - Configuration to be done in cPanel WHM

    Explanation:

    Any email with a header will increase in length every time the user replies or forwards the same mail.

    When sending emails via SMTP from Outlook, these headers need to be processed properly according to the value set in cPanel EXIM. If cPanel EXIM is configured with a header size limit smaller than 2048 bytes, outgoing emails will result in an error message. The solution is to increase the header size limit, as shown in the above screenshot.

    Unfortunately, hosting companies often refuse to make this change, citing reasons such as "this is not possible" or "we cannot do this on shared hosting."

    To resolve this, I created my own cPanel/WHM VPS server to have full control and apply this fix.

    Quick fixes if your hosting provider doesn't respond:

    1. Copy-paste the email content into a new email and send it. (This works for long-threaded emails with many replies.)
    2. Use Mozilla Thunderbird, which does not have this issue.

    If your hosting provider has made the required changes and your problem is resolved, please mention the provider's name here.

    Good luck!

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  3. Anonymous
    2024-09-25T06:32:01+00:00

    I have the same issue, I have followed your instructions but it did not work. users still facing the same issue

    message has lines too long for transport

    not all users have good knowledge of computers so such an error is impacting our business

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  4. Anonymous
    2022-12-09T16:57:49+00:00

    I tried with Thunderbird and it really works fine so it is all about outlook and microsoft is not keen to do anything with this.

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  5. Anonymous
    2022-12-09T14:54:43+00:00

    I am using Microsoft 365 and saw this error started happening on all my computers. And yes only happens with existing emails but not with Hotmail email configured within Outlook but another email that is hosted through GoDaddy.

    I am not sure if this is related but after over couple weeks of interactions with GoDaddy it seems like an issue with Outlook.

    Why isn't anyone from Microsoft looking at this? Seems like pretty old issue but no interaction from Microsoft??

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