Sending email to former missionaries who served under me

I saw an announcement for mission presidents who served after 2000, their missionaries could opt in to communicate with them. I served in 2003-2006 and the Area is creating a history of the Church in my former mission and suggested former missionaries could contribute. I could see them before, but with the recent update, I cannot see them. How do I find them and how do I send a blast email inviting them to contribute faith promoting experiences?

Ted Ong