I can send and receive emails, no problem. autoresponder does not send anything. I checked the ispconfig logs but found nothing.
Be aware that an autoresponder sends only one response in a certain time (a few days) to the same account to avoid spam, so you can't test it by sending emails again, you won't receive an answer even if it is set up correctly.
Please see post #5, I explain there how autoresponders work and that it will respond just once, in case you send multiple emails.
I tried from outlook.com and it responded. yesterday not responded to gmail but today it started to respond. I'm sure that I did the same setup yesterday.