[MlMt] Set Outlook Outbound Important Flag?

[Alan Dobkin]

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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