Customise email type "mailing_list"

[joshwhit (Josh Whiteside)]

Hi,

I’ve found it is possible to edit the subject line for generic emails such as this one like so:

How to customize the emails for mailing list mode?

Hello. Some of our users use “mailing list mode” and we’d like to make some slight modifications to the subject of email that they get every time someone posts. I went to the Email Templates part of Discourse Admin area but can’t find this email listed. Is it possible to customize this type of email? Thanks!

I’ve changed the email subject to:
%{optional_cat}%{topic_title}

This results in a peculiar subject title:
[[Category] ] Topic

I think the extra square brackets are for the subcategory but we don’t use them. Does anyone know how to set up a subject title without these extra square brackets?