bounce error : message has lines too long for transport

When an email is replied to in Windows Outlook, an item is added to the "References" header. This header keeps growing in size on each reply until it is split up by Outlook at 1012 characters. The problem is that the RFC SMTP line length limit is 998 characters, resulting in many servers rejecting the message as having lines that are too long.

This issue has persisted for many years and Microsoft seems uninterested in fixing it. All it requires is for them to reduce the references header split length in Windows Outlook to 998 characters.

Also, if anyone is experiencing this issue, the workaround is to click New Email and paste the old email into it, instead of clicking Reply. This causes Windows Outlook to remove the references header altogether.

I have exact the same issue. Please let me know if yours got resolved. This is a new issue, never happed before.

no still not solved, no one is answering from Mircosoft, what a good service!

Dear Ankita

thanks for your support,

but I tried this way before because I did googled it before and this method did not succeeded

i did send you a Private Message

Hello Ahmad Altaher,

Good day to you and hope you are doing well.

Regarding your issue, would like to confirm does the same issue occurs if you send email via web mail app? If you haven’t check with web mail app, kindly check from there. If web mail app side same issue, kindly provide us your web mail app link and if web mail app side has no issue, it means issue is with Outlook desktop app.

For Outlook desktop app, we found that when user sending email from Outlook desktop app and Outlook is not configured to correctly wrap the sentences within the email, this type of error occurs. Long lines can be hard to read in emails, as such it is considered proper email etiquette to break the lines of your messages to somewhere between 65 and 76 characters. When you wrap long lines of text, the Outlook email client automatically breaks sentences away from the current line to start on a new line. This shortens the length of all outgoing emails and is similar to narrowing the margins of the writing space. So given this situation, we also recommend to kindly check your settings and set accordingly to see if it makes any difference.

To do so : Open Outlook > go to File > select Options > go to Mail > under Message format > check for Automatically wrap text as character settings and set between 60 to 76 > click Ok to save changes > restart Outlook.

Screenshot for your reference:

If still facing the same issue, request you to kindly provide us this entire bounce back message and your Outlook Office account page screenshot via open Outlook > File > Office Account via Private Message only, so based on it we will further check from our side and assist you. At this point, your kind understanding and co-operation will be highly appreciated.

Thank you so much for your precious time. Stay safe and healthy.

Regards,

Ankita Vaidya