Unfortunately, "auto-responders" are responsible for a great deal of unwanted email on the Internet. Spammers seldom use their real address when sending email and when they send to an account that will "auto-respond" this reply ends up being sent to an innocent bystander whose address was "spoofed" as the sender of the spam message.
It's not unheard of for such a person to receive tens of thousands of "auto-replies" to emails they never sent. Because of the great inconvenience this creates for people victimized in this manner, OnlyMyEmail does not provide any auto-response services to it's clients, nor do we use them ourselves.