What's the plural form of auto-reply? Here's the word you're looking for.
Answer
The noun auto-reply can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be auto-reply.
However, in more specific contexts, the plural form can also be auto-replies e.g. in reference to various types of auto-replies
or a collection of auto-replies.
Examples
I sent an email to the school secretary, only to receive an auto-reply.
I'd like to be able to disable auto-reply for certain users.