You can do it via a filter: filter_hook_espresso_post_prepare_email_data
Which allow you to hook in with a custom function and alter the data used in the emails.
Or another option is to use the Email Manager built into Event Espresso which allows you to set the Email Subject within the admin. You would then need to set the events to use a custom confirmation email and select the custom template you created.
The support post ‘EE3 Registration Confirmation Email’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.