How to disable / hide send copy to option in mail box page. What is happening is If am setting a send copy to -email address outside the server for example a email@example.com in firstname.lastname@example.org then a mail sent from say email@example.com is being sent using SMTP of my server as if the mail is originating from my server that is from firstname.lastname@example.org. I am using relay server and in no way I can validate this address i.e. email@example.com and there will be numerous instances of outside sender sending mail to firstname.lastname@example.org and those senders are becoming senders from my server and postfix is alllowing it as relay email address of email@example.com So either the from address is changed to firstname.lastname@example.org with some header as email@example.com or I am able to completely take that option off of - send copy to. Thanks.