Hello, Guys,
Interval: In hours, for the autoresponder to wait between responses to the same email address.
For example, if you set up an autoresponder with an interval of 24 and you receive an email from user@example.com at 8:00 AM on Monday, the autoresponder immediately responds to the message. If, however, user@example.com continues to email you throughout the day, the autoresponder does not send another response for 24 hours after the initial email (in this case, 8:00 AM on Tuesday). If user@example.com emails you again after the 24-hour interval expires, the system sends them an autoresponse.
Update: https://goo.gl/e81abo
Note:
If you set the interval to 0, the system sends an autoresponse to each email.
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