Workaround : Zimbra HTML Problem after Patch 26/33

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I just patching my Zimbra 8.8.15 to patch 33 and Zimbra 9 to patch 26. However, I got problem view email with HTML mode on Zimbra webmail. The email has content “if !mso”. Some users on Zimbra forum have similar problem : and maybe Bug :

This image from github

I do not know if this a safe workaround or not. However, this problem is quite annoying on end users. So, I do this until there is a safe way from Zimbra

su - zimbra
zmlocalconfig -e zimbra_use_owasp_html_sanitizer=false
zmcontrol restart

Now, the content “if !mso” has disappear from Zimbra webmail

Good Luck 🙂

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