Mailchimp, the email marketing platform owned by Intuit, surveyed 6,000 consumers across Australia, Canada, New Zealand, the United Kingdom and the United States together with the consultancy Ascend2. 71% say they receive more marketing emails than before, and 63% say the same about texts, according to the survey summary published by MarketingProfs, a marketing trade publication. 68% point to excessive messaging as the main reason for unsubscribing. In Europe, Splio, a French CRM platform, measured 340 brands across France, Spain and Italy: between January 2023 and August 2025, marketing email volume rose 13% while clicks fell 23% (22% in Spain). Brands are sending more, and people are responding less.
Generative AI has pushed the cost of producing a message down to nearly zero. A team that used to write one campaign a week can now draft ten variants in an afternoon, so volume is no longer capped by team capacity. It’s capped by brand discipline, and when that discipline is missing, two things grow at once: the number of messages and how similar they are to each other. If the brand doesn’t pump the brakes, someone else will. Users unsubscribe or stop reading, and the companies that control the inbox measure each sender’s engagement and decide who gets through.
Aggregate data doesn’t yet show that AI has inflated overall volume. Validity, a deliverability software company (deliverability being a message’s ability to land in the inbox rather than spam), reported in its 2026 benchmark that global send volume fell in 2025 compared to the previous year for the first time in the report’s history. It attributes this to new email provider rules and to AI helping marketers send “smaller, more targeted, higher-value” campaigns. The risk shows up case by case. ActiveCampaign, another email marketing platform, told the story of The Maccs, a U.S. agency that in March 2026 began drafting with Claude, Anthropic’s AI model, and started sending roughly 40% more emails. In the first few months, its unsubscribe rate dropped from 0.338% to 0.301%. By September it climbed back up, to 0.39%.
Our thesis is that in 2026 a lifecycle marketing strategy works like a permissions system. You ask for consent and preferences, you send when there’s a signal of intent, you set a frequency cap that’s consistent across all channels, and you measure clicks, replies and revenue per recipient.
Lifecycle marketing is the messaging plan that follows each customer through their stage: signup, activation, purchase, repeat purchase and churn risk. It defines what message to send, through which channel, and when, based on what the person does and what they’ve authorized.
Gmail, Apple and WhatsApp are already rationing attention
Email: Gmail, Yahoo and Microsoft’s rules for bulk senders
Since February 1, 2024, Gmail has required anyone sending more than 5,000 messages a day to Gmail accounts to authenticate their domain and offer one-click unsubscribe on marketing emails, according to its sender guidelines. Gmail’s subscription guidelines require processing every unsubscribe within 48 hours and confirming each address before messaging it. Yahoo announced equivalent requirements for the same date.
The number that matters most is the spam rate, the percentage of recipients who mark your emails as spam. Gmail asks senders to keep it below 0.1% and never reach 0.3%. Above 0.3%, a sender loses the ability to ask Gmail for help resolving delivery issues, according to its FAQ for senders. There, Gmail also warns that “starting in November 2025, Gmail will ramp up enforcement of its rules on non-compliant traffic,” with both temporary and permanent rejections.
Microsoft joined in on May 5, 2025: Outlook.com rejects messages from domains sending more than 5,000 emails a day without SPF, DKIM and DMARC, the three protocols that prove an email comes from who it claims to come from. The rejection arrives as error 550 5.7.515.
Apple Mail Privacy Protection and the open rate
Mail Privacy Protection (MPP) is a privacy feature in Apple’s Mail app that pre-loads images in every email, including the invisible tracking pixel that registers an open, even if the person never reads it. Litmus, an email testing tools company, measured more than 1 billion opens in July 2026: Apple accounts for 62.26% of tracked opens and Gmail for 27.03%. Litmus estimates that MPP affects “approximately 55 to 60% of all opens.” The open rate has stopped being a useful measure of interest.
WhatsApp: per-user limits on marketing messages
Meta caps how many marketing messages each WhatsApp user can receive from businesses. According to Meta’s developer documentation, the limit depends on “how much that person has read their recent marketing messages and how many messages they have in their inbox from friends, family and businesses.” When a business bumps up against that cap, the message isn’t delivered and the API returns error 131049.
The limit counts messages from all businesses combined, according to Klaviyo’s help guide, the marketing platform that integrates WhatsApp. Your promotion competes for the same quota as any other brand messaging that person. Utility messages (confirmations, shipping alerts) and replies sent within 24 hours of the user writing in fall outside the limit. In the United States, WhatsApp has flatly stopped delivering marketing templates since April 1, 2025. And since July 1, 2025, Meta charges per delivered message, based on category and country. We’ve previously covered how AI optimization changes what gets through on WhatsApp.
Consent-based marketing: what the law requires
Platforms set technical caps, and the law sets the floor. The four regulations that matter most to a brand selling to Spain and Latin America say the following.
- Spain. Article 21 of the Information Society Services Act (LSSI) prohibits sending commercial communications by email or equivalent means “that have not been previously requested or expressly authorized.” The exception is for existing customers, for products similar to what they already bought. The opt-out must be offered when the data is collected and in every message.
- Argentina. Article 27 of Law 25,326 on Personal Data Protection establishes that the data subject “may at any time request the withdrawal or blocking of their name” from databases used for marketing. Law 26,951 created the National “Do Not Call” Registry, which covers telephone services “in any of their forms,” and requires advertisers to check it. We could not find a legal source confirming whether it covers WhatsApp messages.
- Brazil. The General Data Protection Law (LGPD) allows consent to be revoked at any time, through a free and simple process.
- European Union. Article 21 of the General Data Protection Regulation (GDPR) gives every individual the right to object to direct marketing at any time. Once they object, their data can no longer be used for that purpose.
The personalization platforms are building with user data points in the same direction, toward more data and more control: we saw this when Google began using AI Mode’s personal context to target ads. For a brand, the only defensible personalization is the kind built on what the person actually authorized.
Real cases: Chedraui, Movistar Argentina, DR Lava Tudo and two U.S. brands
These five cases show brands that sent less, or sent better-targeted messages, and held or improved their results. All figures are as reported by the company itself or by the vendor that published the case study.
| Brand | What it did | Reported result | Source |
|---|---|---|---|
| Chedraui (supermarket chain, Mexico) | Personalized WhatsApp messages using purchase and redemption history. Used carousel templates, which show several offers in a single message | Between March 1 and May 7, 2025: 74% open rate, 3.8x return on WhatsApp spend, and 30% lower ad spend, because the templates “reduced the number of messages sent” | Success story published by Meta |
| Movistar Argentina (telecom and internet) | Fiber optic offers via WhatsApp sent only to existing customers, segmented using their data, with an automated sales flow | Between January and October 2024: 70% lower customer acquisition cost than phone sales, and triple the share of sales coming from WhatsApp | Success story published by Meta |
| DR Lava Tudo (home cleaning, Brazil) | Automated cart-recovery flows via WhatsApp connected to its CRM | Recovered carts rose from 4,865 in 2023 to 10,702 in 2024, and cost per conversation dropped from R$25 to R$3 | Case study published by 360dialog, a WhatsApp API provider |
| Jenni Kayne (apparel and home goods, United States) | Went from up to three campaigns a day during peak season to a maximum of one targeted email per day, segmented by purchases, browsing and stated interests | Email revenue 14.5% higher than the prior year | Klaviyo blog |
| SharperImage.com (retail, United States) | Predictive scoring to send only to those most likely to buy | 10% more revenue with 22% fewer emails, 28% fewer unsubscribes, and 49% fewer spam complaints | Case study published by Tie, the tool’s vendor |
Rafael Orozco, marketing director at Chedraui, sums it up this way in Meta’s case study: “WhatsApp became more than just a channel. It’s the space where we turn transactions into relationships.” At SharperImage, the team feared that sending 20% less would mean 20% less revenue, as they told Tie. Revenue went up instead.
A lifecycle marketing strategy in 6 steps
1. Treat consent as an asset
Use double opt-in for email: Gmail recommends confirming each address before sending it campaigns. Ask for an explicit, separate opt-in for WhatsApp, SMS and push. Log the source and date of each consent, because the LSSI, the GDPR, the LGPD and Law 25,326 may require you to prove it.
2. Ask each person what they want to receive
Build a preference center covering topics and frequency, visible at signup and in every message. The information a user deliberately gives you this way is called zero-party data. Jenni Kayne used it from its signup forms to separate people buying clothing from people buying home goods.
3. Send based on intent, and cut back on mass sends
Messages triggered by a user action outperform any blast sent to the whole base. According to Validity, 2% of email volume generated 37% of email-attributed sales. In Splio’s data, manual segmentation achieves a 1.4% CTR, while AI-selected audiences hit 2.8%. Here, AI is most useful for deciding who not to message.
4. One frequency cap across every channel
Set a weekly message budget per person that combines email, SMS, WhatsApp and push. In the Mailchimp and Ascend2 survey, 26% of consumers say one or two messages a week from a brand is already too many, and another 43% put the limit at three or four. WhatsApp already applies a per-person cap that counts every business combined, so plan as if your quota were shared — because it is.
5. Pick the channel based on the type of message
On WhatsApp, utility messages and replies sent within the 24-hour window don’t count toward the marketing limit. Use them for order updates and customer service, and save marketing templates for the people who actually read what you send them.
6. Measure what people actually do
Track clicks, replies, revenue per recipient, unsubscribe rate and spam rate, with alerts before your spam rate hits 0.1% on Gmail. Drop the open rate from interest reports: with MPP, Apple registers a good chunk of those opens without anyone actually reading anything. If your team has a GTM engineer, the role that builds out the marketing and sales operation end to end, this dashboard is part of their job.
In 2026, the scarce resource in a lifecycle program is each user’s permission to keep receiving messages. Measure it like inventory: how many people granted it, how many withdrew it this month, and how much revenue each remaining one generates.
Frequently asked questions
What is a lifecycle marketing strategy?
A lifecycle marketing strategy is the messaging plan that follows each customer through their stage: signup, activation, purchase, repeat purchase and churn risk. It defines what message to send, through which channel, and when, based on what the person does and what they’ve authorized. In 2026 it also includes a frequency cap shared across every channel, because Gmail and WhatsApp already limit sends based on engagement.
Why do people unsubscribe from marketing emails?
People mostly unsubscribe from marketing emails because they receive too many. In a Mailchimp and Ascend2 survey of 6,000 consumers across Australia, Canada, New Zealand, the United Kingdom and the United States, 68% named excessive messaging as the main reason for unsubscribing, and 71% said they received more marketing emails than before.
How many marketing emails per week is too many?
There’s no single number, but the Mailchimp and Ascend2 survey offers a reference point: 26% of consumers say one or two messages a week from a brand is already too many, and another 43% set the limit at three or four. Gmail, for its part, asks senders to keep their spam rate below 0.1% and never reach 0.3%.
Does WhatsApp limit the marketing messages a user can receive?
Yes. According to Meta’s developer documentation, WhatsApp applies a per-user limit on marketing messages that depends on how much that person reads them and how many messages they have in their inbox. The limit counts messages from all businesses combined. Utility messages and replies sent within the 24-hour window fall outside the limit.
What does the law require for consent-based marketing?
Consent-based marketing requires sending communications only to those who authorized them and offering an opt-out in every message. In Spain this is set out in Article 21 of the LSSI, with an exception for existing customers and similar products. In the European Union, the GDPR gives people the right to object to direct marketing at any time, and in Argentina, Law 25,326 allows people to request removal from marketing databases.