☑ [Mailing List mode] Replies should start with a Re:

[downey (Michael Downey)]

As far as I understand your request, you can already configure this in the site settings by using the %{optional_re} in your subject format:

(Superseded) Customize the subject format for standard emails

This content is now covered in Customize specific email templates So you want to customize subject format for standard emails? Great, let’s get started! The subject for standard emails can be customized from: Admin / Customize / Email [image] Available formatting options are: %{optional_re}[%{site_name}] %{optional_pm}%{optional_cat}%{topic_title} %{optional_re} → Re: (applicable if the post is a Reply) %{site_name} → Community Title %{optional_pm} → [PM] (a…