Top Email Autoresponder Services Email Autoresponder Services automates the task sending pre-written email messages in response incoming emails, but some let you send scheduled, follow-up email marketing messages and broadcast newsletters. Here are most popular autoresponder software services. Autoresponder software primarily automates the task sending pre-written email messages in response incoming emails, but some let you send scheduled, follow-up email marketing messages and broadcast newsletters. broadcastemailmarketingmessagessendunlimited with system:unfiledby 6 users