Simple email list manager

Question

I'm looking for a simple email list server that I can install on my organization's web server.

I'm the webmaster for a small charitable organization with about 600 regular donors and one or two major events each year; currently our Corresponding Secretary manages donor communications manually using Thunderbird and Quattro Pro. I'd like to automate this, as well as facilitate communication between the Directors of the organization.

I need the following capabilities:

• Manage two or three separate lists of recipients
• Manual approval of outgoing mailings
• Double-opt-in subscribe
• Double-opt-out unsubscribe
• Should encrypt subscriber addresses, although I can hack this in myself if needed

In addition it has to run on our server, under PHP 5.6 and MySQL 5.something.

Answer 1

Since asking this, I have discovered that my hosting provider includes MailMan in my hosting package; this has proved perfect for communication among the Executive and the Members.

For Donor communication, I have gone with phpList which offers a central subscriber database with separate subscription lists, bounce management, subscriber import/export as .csv file, and it is Open Source and runs on our server. For those who need it, they also offer a managed service option akin to MailChimp.