I write an email to 6 people with the subject "Proton Wish". Most people reply with the subject unchanged and their reply is just added to the conversation. However, some user client software replies back with the subject changed to "Re: Proton Wish", which are flagged as unrelated to the first and a whole new conversation is started by Proton. Is there a way for Proton to either ignore the 'Re:', or let me manually merge the conversations?