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How to add custom module in email module "To" button

Question asked by Ajay Kumar on Oct 17, 2015
Latest reply on Oct 17, 2015 by Shijin Krishna
In Email compose page,I want to add one custom module in "To" button.

By default  "To" button, will be "All,Users,Contacts,Leads,Targets,Accounts.

Here i need to add my custom module,if user selects custom module,it should give email id and person name in below.

I am able to do it through modifying core files.I edited crm/modules/Emails/EmailUI.php and EmailUIAjax.php

Is it possible to do it in upgrade safeway?

I am using SugarEnt-

Many thanks in advance.