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Prevent comment outs in HTML emails from being rendered

We have implemented the following code in our HTML emails to make them compatible with various versions of Microsoft Office.

"<! --[if gte mso 9]"

When this code is given and delivered from Acoustic Campaign, some MS Outlook environments will display this code as is in the body of the email.

This is because the HTML comment-out "<! --" in the HTML comment-out is not handled correctly.

This may be due to the receiving environment, but for emails delivered from other systems, the comment-outs are handled correctly and do not appear in the body of the email.

By reviewing the process by which Acoustic Campaign creates HTML emails, more customers will receive the ideal emails.

This will result in more Conversion of emails delivered from Acoustic Campaign.


  • Shunsuke Nakamura
  • Sep 10 2023
How will this idea be used?

Ideally, the HTML emails we deliver should reach our customers without any crumbling.

This problem is not limited to Outlook, but can occur in many different receiving environments.

Acoustic Campaign has a very powerful email delivery engine. It is capable of delivering very high volumes of emails, so the email delivery system must be able to adapt to a variety of receiving environments.

What is your industry? Other
What is the idea priority? Medium
  • 華恵 田中 commented
    September 11, 2023 06:12

    We will reproduce this with a drag-and-drop editor. Therefore, Acoustic Campaign users cannot adjust the HTML source code. Acoustic will need to fix the Message Composer's program.