[MlMt] Set Outlook Outbound Important Flag?

[Henry Seiden]

Alan,

Is the attachment of the same X-Priority header to an AppleMail, Yahoo Mail, or other commercial server account the same? My Apple Mail app seems to accomplish it OK within my little group of accounts.

MM seems to recognize incoming flags of this nature from all senders, on all accounts with no problem.

Respectfully,

Henry Seiden
- -
Techworks Pro Co.
E: info<at>techworkspro<dot>com
W: http://techworkspro.com

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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