This blog post from Paul Homes, https://platformadmin.com/blogs/paul/2011/06/noxcmd/, might help providing additional instructions for diagnosing and enabling/disabling the XCMD functionality…if indeed the xcmd is what holding you off from sending HTML-format email. The blog mentions the possible multiple NOXCMD location settings on different server instances (workspace, pooled workspace, STP, SASMeta), so you just want to be sure the specific NOXCMD setting you made earlier reflect the way how the code is called. Hope this helps!
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