Send messages by email, voicemail and SMS so you can always reach your donors and your nonprofit community to help with raising money for charity, coordinating an event and more. Volunteers most likely have other jobs or duties, so they will be on the go. SMS would be most effective. Donors on the other hand will appreciate a personalized email to set up a phone call. By simply setting up frequent messages, you can keep an open line of communication with your most important contributors. Don't let your cause be forgotten.