Setting not working as expected

[andreasfc]

I was expecting the following setting would send an email with Category in the email subject:
$g_email_set_category = EMAIL_CATEGORY_PROJECT_CATEGORY;

But this looks like it is not working.
Thanx

[atrol]

I found no code where this is implemented.
This is a known bug
http://www.mantisbt.org/bugs/view.php?id=7036

But I also think that the one who implemented this in an earlier version had not the same understanding of category.

Extract of documentation:
Specify whether e-mails should be sent with the category set or not.
This is tested with Microsoft Outlook. More testing for this feature + other formats will be added in the future.
......

Subject of email is not specific for Outlook

If I understand right, you want to see the category in the subject of the email?
AFAIK there is no other chance to customize the subject than to tweak the code of function email_build_subject in file core/email_api.php
There is already a feature request for this at http://www.mantisbt.org/bugs/view.php?id=8986