Please add option to Mail Server configuration to From Address field.
Will be nice if email on changes will send with "From" field of updater.
John create issue and assign it to Jack.
Jack get email message from "John <firstname.lastname@example.org>" - "[JIRA] Issue Assigned ... etc".
Jack complite issue and resolve it.
John get email message from "Jack <email@example.com>" - "[JIRA] Issue Resolved ... etc"