How to auto-reply email?

Question

Email

Tell me how to make an autoresponder for requests?
there are many services, is there a php code?
for example, an application comes with a form, you must quickly answer "thank you, please wait ...."
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Answer 1

Isn't it easier to set up an automatic response template on the mail service?
If you use a major mail service like 99% of the world, then such a service already has this functionality.
True, there is no difference between the application or something else.