What type of email feature allows users to automatically respond to messages?

The feature that allows users to automatically respond to incoming messages is auto reply. This function is particularly useful for situations where the recipient may not be available to respond right away, such as while on vacation or during out-of-office hours. When activated, it sends a predetermined response to anyone who emails the user, letting them know that the email has been received and that the user may not be able to reply immediately. This ensures effective communication and can provide important information to the sender, enhancing overall correspondence management.

Other features like filters, block lists, and forwarding serve different purposes such as organizing incoming messages, preventing unwanted emails, or redirecting emails to another address, respectively, but they do not provide the ability to send automatic replies to incoming messages.