Direct Mail vs Email: Which Performs Better for E-Commerce?
Email marketing built e-commerce. But its effectiveness has been declining for years — inbox competition, spam filters, Apple Mail Privacy Protection, and unsubscribe fatigue are all taking their toll. Direct mail is emerging as a complementary channel that reaches customers email can't. Here's how the two channels compare on the metrics that matter.
Response rates
Direct mail achieves an average response rate of 4.4%, compared to 0.12% for email — 37 times higher (ANA/DMA Response Rate Report). For e-commerce specifically, the gap can be even larger because direct mail reaches customers who have unsubscribed from or stopped opening emails entirely.
Open rates
Physical mail has a 91% open rate. There's no spam filter, no promotions tab, no algorithmic suppression. The average e-commerce email open rate is 15–21% and declining annually (Litmus, Klaviyo). Apple Mail Privacy Protection has further inflated email open rate metrics, making them less reliable as a performance indicator.
ROI comparison
Direct mail returns an average of €42 for every €1 spent, compared to €36 for email (ANA/DMA). While email has a lower absolute cost per send, its lower response rate means you need to send many more emails to generate the same number of conversions. Direct mail's cost per response is €13.50 vs €22.80 for email — 41% cheaper per actual response.
When to use each channel
Email remains excellent for transactional messages, order confirmations, and high-frequency touchpoints. Direct mail excels at high-impact moments: win-back campaigns for lapsed customers, birthday and VIP rewards, and post-purchase relationship building. The most effective retention strategy uses both channels — email for volume and frequency, direct mail for the moments that matter most.
GDPR considerations
Email marketing requires explicit opt-in consent under GDPR. Direct mail to existing customers operates under the legitimate interest basis (Art. 6(1)(f)), meaning you can send postcards to customers who have purchased from you without requiring separate consent. This makes direct mail especially valuable for reaching customers who have unsubscribed from email.
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