Why doesn't the autoresponder work for messages from the site?

Question

gmail

Why doesn't the autoresponder work for messages from the site?
After filling out the form on the site, messages come to gmail, set a filter so that messages are not sent to SPAM, messages come all buzzing - but the autoresponder does not work. Because of which? And can something be done?

Answer 1

Most likely, SPF-authorization of sent emails does not pass, check the headers. To avoid spam through auto-replies (an auto-responder with spam text is formed and letters from fake addresses are sent to it, as a result, spam from the auto-reply comes to fake addresses), auto-replies are usually sent only to authorized addresses.