When my members choose to watch a category, then another posts new topic, they will receive an email for that.
But here is the current email content:
Subject: Topic title
Content: The whole topic.
I want to edit the template of this email to:
Subject: “A new topic has arrived…”
Content: Just a summary of the topic, around 100 words or the first paragraph.
How can I do this? I couldn’t find that email template in the admin settings area?
You can’t do this yet as the emails are coded by the core with variables that are defined in the core. You will need plugin to override what these variables output in the email template. I am hoping that Discourse develops something similar to Wordpress Filters, so that it will be possible for anyone coding noob to easily override some variables, like these email variables, and customize them without having to write a complicated plugin every time you need to customize some output. Discourse has already implemented something akin to Wordpress Actions with plugin-outlets, but they have yet to implement something like Wordpress Filters, as far as I can tell.