In planning direct mail campaigns, marketers often turn to standard industry benchmarks courtesy of the annual “Response Rate Report” from the Data & Marketing Association (DMA), soon to be a division of the Association of National Advertisers (ANA). However, while general direct mail response rates for house lists (5.1%) and for prospect lists (2.9%) far outpace those of digital media, the mailing piece format selected can make a key difference in expected results.

Mailer Format Shifts Response Metrics

For example, an oversized flat envelope package tends to deliver the highest response rate: 6.6 % for a house file and 4.9% for a prospect list. Next most effective in terms of response are postcards, with a house file response rate of 5.7% and and a prospect names’ response of 3.4%. At the tail end, but still far above digital efforts, comes the standard letter format, with a 4.37% response rate for house names and a 2.5% response for prospecting.

Balancing CPM & ROI in Format Selection

Some marketers hesitate over the more expensive oversized flats, which have the highest cost per thousand (CPM) among formats at $481 for house files and $467 for prospect files. Which is why postcards continue to win fans among B2C and B2B marketers, with the lowest CPM among direct mail formats benchmarked. However, despite their higher CPMs, the solid response rates of flats mean they can deliver the highest ROI (37% and 30% for house and prospect names, respectively). Postcards and letter packages, meanwhile, are tied in terms of ROI, with house mailings garnering a 29% ROI and prospecting turning in 23% ROI.

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