Desktop Outlook Stopped showing some HTML emails correctly beginning around November 1st, 2018. It strips the CSS from the email and attaches it as ATT00001.css

Desktop Outlook Stopped showing some HTML emails correctly beginning around November 1st, 2018.  It strips the CSS from the email and attaches it as ATT00001.css

This means that emails that formerly rendered well with an HTML body are now difficult to read.  We have certainly made no changes to the HTML documents that are attached to the emails.  The HTML documents are generated by Nunit, specifically nunit2report, which we have not touched in more than 5 years.

Is there an option we can control to get the HTML emails in desktop Outlook (on Windows) to render as they did last week?

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What do you use for antivirus/ spam scanner?
Does nunit send the messages right to the smtp server or does it integrate with outlook and outlook sends them?
Diane Poremsky [Outlook MVP]
Outlook Resources: https://www.slipstick.com
https://www.outlook-tips.net

** I don't work for Microsoft.**
** DO NOT CALL phone numbers received in email notifications.**

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We use symantec.  Nunit sends the HTML straight to the SMTP server.

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>> We use symantec.
Was an update installed right before this problem started?

Are you using Office 365 mailboxes?

Do you know if nunit used to link to an external style sheet? It sounds like it did and now its getting pulled down and attached. It could be Symantec or some other security setting on the server doing it.
Diane Poremsky [Outlook MVP]
Outlook Resources: https://www.slipstick.com
https://www.outlook-tips.net

** I don't work for Microsoft.**
** DO NOT CALL phone numbers received in email notifications.**

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There were no recent updates to the server where we generate the emails to SMTP in many months.

I do notice that the rendering problem has been occurring for more than 6 months when viewing the same emails via the web interface for Outlook (which we don't use often); but the problem just recently occurred when viewing the emails with the Desktop version of Outlook.

The nunit .html file does NOT have an external .css.  Something, probably Outlook, or Symantec, is extracting CSS from the HTML and creating the separate ATT00001.css file then attaching that to the email.

Thanks for your input so far!

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>>
Something, probably Outlook, or Symantec, is extracting CSS from the HTML and creating the separate ATT00001.css file then attaching that to the email.
>>
Yeah, now to figure out which one is doing it. :(
Diane Poremsky [Outlook MVP]
Outlook Resources: https://www.slipstick.com
https://www.outlook-tips.net

** I don't work for Microsoft.**
** DO NOT CALL phone numbers received in email notifications.**

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I'm sure it must be Office365/Outlook since the web version of Office365/Outlook does it and it would not be affected by our version of Symantec.

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Hello Rob,

 

Thanks for your reply.

 

If directly send the html document via the OWA or Outlook client, does the issue persist? Please add that attachment after you input the email's body to test it again.

 

Regards,

Rudy

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I don't know how to change the software to send the html document view OWA or Outlook.  The process runs in the background, there is no interactive user, and it sends the html via SMTP.   We have been using this process for ten years.  Clearly a recent change in Outlook.  It seems very similar to this issue: 

https://exchange-server-guide.blogspot.com/2015/11/att00001.txt-file-fix-email-attachment-issue.html

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Hello Rob,

 

Thanks for your reply.

 

Could you please send us a test effected email for us to check it? I will send you a private message to collect it.

 

Regards,

Rudy

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Hello Rob,

Thanks for the information. We will check it. But we still need to collect the received effected email. You can drive it to the desktop which will saved as .msg file, and then please upload it to any trusted web drive. Then share the link in private message for us to access.

We would highly appreciate your efforts.

Regards,

Rudy

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Last updated April 10, 2020 Views 207 Applies to: