[MlMt] Set Outlook Outbound Important Flag?

[Jonah Lefkoff]

Thanks Alan! Setting the `X-Priority` header to `1` and the `Importance` 
header to `high` did the trick.

Jonah

On 10 Dec 2025, at 17:06, Alan Dobkin wrote:

> Hi Jonah,
>
> It's a bit tricky, but here are the basics:
>
> First, you'll need to add an X-Priority header option to the composer 
> headers menu. The command to do this is documented here:
>
> https://manual.mailmate-app.com/hidden_preferences#composing
>
>> The composer allows you to enable/disable various headers in the 
>> headers menu (far left of the status bar in the composer window). The 
>> list of available headers can be augmented as follows:
>
>     defaults write com.freron.MailMate MmAdditionalComposerHeaders "( 
> { headerName = 'X-Priority'; defaultValue = '1'; type = 'plain'; } )"
>
>> In this example, an X-Priority header is made available. Giving it a 
>> value of 1 is going to make the message a high priority message (at 
>> least according to some email clients). Note that this is a really 
>> low-level feature. Make sure you know what you are doing before 
>> adding non-standard headers to outgoing messages.
>
> After you do this, you can select the X-Priority header when you want 
> to mark an outgoing message as important. There is no official 
> standard for how this header is used, but generally the values work 
> like this:
>
> 1: High priority
> 3: Medium priority
> 5: Low priority
>
> There is also a separate Importance header which is used in some 
> cases, as well as a plain Priority header and one named 
> X-MSMail-Priority. These are all used in various ways by different 
> mail clients and cloud email services.
>
> Alan
>
> On 12/10/2025 9:48 AM, Jonah Lefkoff wrote:
>> Hi Mailmate Group,
>>
>> I have noticed on a few emails incoming from my university outlook 
>> email have an “important” exclamation point in the flag column. 
>> I’d like to know how to set this message status in a new outgoing 
>> email. I wasn’t able to find any mention of this in the manual. 
>> I’ve attached a screenshot example of this flag in Mailmate.
>>
>> Thanks!
>>
>> Sincerely,
>> Jonah
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