Customer whenever clicks on 'Reply All' in an email then the 'To' field gets moved to 'From' field and creates multiple references

This issue occurs in all CRM online versions.

Cause :

Below JavaScript code, whose purpose is going to combine “from” field value and “to” field together. The following code is the detail definition for the “Combine” operation

function _appendParties$p(oldParty, newParty, ignoreCurrentUser) {

   if (!oldParty || !oldParty.get_count())

       return;

   for (var userId = Xrm.Page.context.getUserId(),

        counter = oldParty.get_count(),

       i = 0; i < counter; i++) {

       var oldPartyMember = oldParty.get_entities()[i];

       if (!ignoreCurrentUser || !oldPartyMember.getValue("partyid") || oldPartyMember.getValue("partyid").Id !== new Microsoft.Crm.Client.Core.Framework.Guid(userId)) {

           _clearAttributesForNewEmail$p(oldPartyMember);

           newParty.add(oldPartyMember)

       }

   }

}

Suggestion : It should only create the reference one time even if you Reply All multiple time.