As Bennie says, MM is trying to help the inlining process sort it out for 
non-HTML users receiving text-only messages. In the case of my signature, I 
edited it in a dedicated editor (BBEdit), before adding the signature to my MM 
app. Sanitized, as you said. Hence no issue, either way - original release, new 
or old Test Build - in MM. 

In the case of adding HTML while composing, I can see how it would change for 
you depending on the version of MM Test Builds. 

Henry
Henry Seiden, Founder 

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> On Aug 19, 2022, at 04:08, Benny Kjær Nielsen <[email protected]> wrote:
> 
> On 19 Aug 2022, at 1:42, Simon Kaplan wrote:
> 
>> In the last few versions of MM I’ve been getting the following error as I 
>> compose:
>> 
>> Warning: CSS inlining unexpectedly failed
>> A JavaScript exception occurred
>> 
>> And I get a bright orange header bar as I’m composing that says
>> 
>> External command failed:  sanitize-html
>> 
>> Any ideas, anyone?
> 
> The change in MailMate causing this is that MailMate now inlines CSS in your 
> HTML signature before embedding it in the HTML of the message itself. This is 
> actually MailMate trying to help you because a signature should not contain a 
> stylesheet. (I've yet to see an example where someone did this on purpose. 
> It's usually the result of using an entire HTML document as a signature.)
> 
> That said, there might still be a MailMate bug/issue since the inlining 
> failed. You are welcome to send me your signature (off list) and I'll see if 
> I can reproduce it. If I can then I'll look into possible workarounds or a 
> more graceful way of failing.
> 
> -- 
> Benny
> https://freron.com/become_a_mailmate_patron/
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