How to trim system variable in email subject line

Sorry if this sounds very beginner’s question.

We display the category (and subcategory) name in the subject line of the email going out when someone creates a new post.

Our “email subject” line looks like:
[%{site_name}] %{optional_pm}%{optional_cat}%{topic_title}

Is there a way to trim %{optional_cat} to the first 6 characters for example?

Thank you for your help!

1 Like

No, this isn’t possible at the current time.