What is the largest size postcard that can mail at USPS postcard rates and not letter rates?

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• What's the difference between First Class and Standard?
• What products can be delivered with EDDM?
• What is the turnaround for direct mailing?
• What is the minimum thickness postcard the Post Office will accept?
• What is the minimum number of Direct Mail Postcards I can order?
• What is the largest size postcard that can mail at USPS postcard rates and not letter rates?
• What is the difference between EDDM print only and EDDM full service?
• What is included in 4OVER4.COM’s Direct Mailing services?
• What is EDDM full service?
• What happens to the remainders that are not mailed out?