I've followed some guides (like this one) to set up an autoresponse service in Gmail.
I want just one automatic email for each conversation start. Using filters+templates, like it's described in the guide above, and filtering by
label:unread does the trick but it triggers other automatic sendings later, if the conversation goes on with other messages.
How can I avoid that?
Default Out of office service is not an option, since it does not send new responses in a rolling window of four days.