Cart Abandoner: Definition, Bedeutung & Beispiele im Direktmarketing

What is a Cart Abandoner? -- Definition and Meaning

A cart abandoner is an online shopper who places one or more products into an online store's shopping cart but abandons the purchase process before completing payment. The technical term "Shopping Cart Abandonment" refers to the phenomenon itself. In direct marketing contexts, the term denotes both individual users and the overall high abandonment rate phenomenon in e-commerce.

The cart abandonment rate is calculated as the proportion of initiated but uncompleted purchases out of all initiated purchase processes. A meta-analysis by the Baymard Institute covering 50 independent studies determined an average abandonment rate of 70.22 percent -- meaning more than two-thirds of all online shoppers who add products to their cart do not complete the purchase. For the German market, Berlin-based provider uptain delivers specific data: in the first half of 2025, the average cart abandonment rate in Germany was 71.72 percent. In certain industries, the rate is even higher -- for flight bookings and travel, Baymard reports rates exceeding 80 percent.

For online retailers, cart abandoners represent one of the largest untapped revenue opportunities. With monthly shop traffic of 100,000 visitors and a 5 percent add-to-cart rate, 5,000 users add products to their cart. At a 70 percent abandonment rate, 3,500 potential orders are lost. Even reducing the abandonment rate by just 5 percentage points at an average order value of 80 EUR means 250 additional orders and 20,000 EUR additional monthly revenue.

Why Do Shoppers Abandon Their Carts?

The reasons for cart abandonment are well-researched. The most comprehensive survey comes from the Baymard Institute (2024), which surveyed over 4,500 US online shoppers. The most common reasons are structural in nature and fall into three categories: costs, process, and trust.

Costs and price transparency are the dominant abandonment reason. 48 percent of abandoners cite excessive additional costs (shipping, taxes, fees) as the primary reason. Another 16 percent could not calculate total costs in advance. Together, cost-related reasons account for over half of all cart abandonments. This explains why free shipping is one of the strongest conversion levers in e-commerce.

Process and usability problems form the second category. 22 percent of abandoners find the checkout process too long or complicated, 24 percent must create a customer account (mandatory registration), and 17 percent experienced technical errors or website crashes. These factors are within the merchant's control and can be reduced through UX optimization.

Trust and payment options constitute the third complex. 18 percent don't trust the shop enough to enter credit card information, and 11 percent don't find sufficient payment methods. In Germany, the importance of payment options is particularly high -- purchase on account, PayPal, and Klarna are among the expected options. Finally, 43 percent of abandoners state they were "just browsing," meaning they had no purchase intent. This group is harder to reach with recovery measures but also demonstrates that over half of abandoners genuinely had purchase interest and are potentially recoverable.

Winning Back Cart Abandoners: Email vs. Print Mailing

The most common recovery method for cart abandoners is the abandoned cart email -- an automatically sent reminder designed to bring the shopper back to the store. Email-based recovery campaigns achieve open rates of 40 to 45 percent and conversion rates of 2.7 to 10.7 percent according to industry data, depending on study and industry. The problem: email marketing requires explicit consent (double opt-in) under the German Unfair Competition Act Section 7(2)(3). Many cart abandoners -- particularly first-time visitors and guest buyers -- have not provided email opt-in. This leaves a large portion of the potential recovery audience unreachable via email.

This is where print mailing as an alternative recovery channel comes into play. Since direct mail is permissible under GDPR without prior consent (legal basis: Art. 6(1)(f) GDPR, legitimate interest), cart abandoners can be contacted by mail even when no email opt-in exists -- provided a delivery address is known. Trigger-based print mailings are automatically sent as soon as cart abandonment is detected and delivered within a few business days.

The effectiveness of this approach is demonstrated by the study "The Abandoned Basket Reactivation Gap" by the Go Inspire Group (2019): print mailings to cart abandoners achieved 113.5 percent of the conversion rate of comparable email campaigns. The print mailing thus significantly outperformed email -- despite being sent only to non-responders of the email campaign, a harder-to-convert audience. The explanation lies in the higher attention physical mail receives: while emails disappear in crowded inboxes or get filtered as spam, an addressed letter is noticed by 83 percent of recipients according to DMM 2024.

Particularly impressive are results from specific case studies. US provider PostPilot documents several cart abandonment campaigns via print mailing: Eyewear manufacturer Caddis achieved a ROAS of 15.28x (i.e., $15.28 revenue per dollar invested) with personalized postcards to cart abandoners. Blade brand Mini Katana achieved a ROAS of 8.3x, and shoe retailer KURU Footwear generated over $2 million in additional revenue with its entire direct mail program (post-purchase, win-back, and cart abandonment). These figures come from actual customer campaigns and exceed typical email recovery results.

Economic Viability: When Print Mailing Recovery Pays Off

The central question for online retailers is: at what conversion rate does print mailing to cart abandoners become profitable? The calculation is simple: with total costs of 0.60 EUR per postcard (postage, printing, personalization) and an average cart value of 80 EUR, break-even occurs at a conversion rate of just 0.75 percent -- less than one order per 133 mailings sent. At the 3 to 8 percent conversion rates documented in case studies, ROAS ranges from 400 to over 1,000 percent.

Critical to economic viability is selecting the right cart abandoners. Not every abandoner justifies a print mailing. Sensible segmentation criteria include: minimum cart value (e.g., from 50 EUR), available delivery address (from previous order or address entry in checkout), no order within 24 to 48 hours after abandonment (allowing email recovery to work first), and not on active objection list (Art. 21 GDPR). Combining email on day 1 with print mailing on day 3 to 5 ensures both channels leverage their strengths: email for quick deciders, print for remaining abandoners with purchase intent.

The CMC Print Mailing Study 2025 provides general benchmarks for print mailing performance in e-commerce: 4.1 percent CVR and 1,011 percent ROAS for existing customer mailings. Cart abandonment mailings target an even more focused audience with concrete purchase interest, which is why CVR in practice often exceeds this average. At the same time, these CMC data refer to general existing customer mailings, not specifically to cart abandonment recovery.

Omnichannel Strategy: Combining Email and Print Mailing

The highest recovery rates are achieved by merchants who use email and print mailing as complementary channels. The CMC study 2021 showed that an email reminder after print mailing delivery increases conversion rate by 101 percent (measured for general print mailing campaigns). Applied to cart abandonment recovery, the following best-practice sequence emerges:

Day 0 (Abandonment): Automated abandoned cart email to all abandoners with opt-in. Content: reminder of left-behind products, direct link to cart. Day 1-2: Second email with incentive (e.g., free shipping or small discount) to non-converters. Day 3-5: Print mailing (postcard or maxi postcard) to all remaining abandoners with known address -- regardless of opt-in status. Content: product image, individual voucher code, QR code to pre-filled cart. Day 7-10: Optional third email touchpoint to opt-in recipients who haven't yet converted.

This sequence ensures no potential buyer is lost: email recipients are reached quickly, print mailing recipients even without digital opt-in. Automation is critical -- manual processes don't scale with hundreds of cart abandonments per day. Platforms like AutoLetter enable API-based integration with common shop systems and trigger print mailings automatically upon checkout abandonment.