What Are Email-Tracking Technologies—and Why Do They Matter?
Most modern email platforms automatically embed tracking technologies, most commonly in the form of “pixels”: tiny, often invisible images embedded in emails. When the email is opened, the image is loaded from a server and transmits data to the sender about whether and when the email was opened and often which links were clicked. This can generate useful metrics on engagement, audience interest and campaign performance.
The difficulty is that this technology usually involves storing or accessing information on the recipient’s device which can be used to identify individuals. As a result, regulators in several jurisdictions are starting to treat these email-based tracking technologies in much the same way as website cookies or other web-based tracking technologies: something that in principle requires notice and, in many cases, prior, specific consent unless a narrow exemption applies.
Whereas compliance for web- and mobile application-based tracking technologies can often be achieved through visible website popups and preference centers, organizations utilizing email-based tracking face greater practical and operational difficulties in meeting the same standard. This is complicated by the fact that some email service providers do not allow customers to disable these tracking technologies, either at all or on a per-recipient basis. Legal requirements, technical constraints and commercial reality do not always line up neatly.
The Emerging Regulatory Picture
Across key markets, a few themes are emerging even as detailed rules and enforcement practice are still evolving.
- United Kingdom
The Information Commissioner’s Office (ICO) has confirmed that email-based tracking technologies, including pixels, fall within the scope of the Privacy and Electronic Communications (EC Directive) Regulations 2003 (PECR) and are therefore treated in the same way as cookies and other web-based tracking technologies. In principle, that means prior consent is required unless the tracking technology is strictly necessary for providing a service requested by the user.
At the same time, the ICO has repeatedly emphasized a risk-based enforcement approach, taking into account how intrusive the tracking is, how clear and prominent the information and consent mechanisms are, and whether there is evidence of consumer harm or concern. To date, the ICO’s enforcement activity has been confined to web-based tracking, and there has been no enforcement action specifically in relation to email-based tracking. That said, recent public guidance and statements by regulators indicate a shift in emphasis, with email tracking now firmly on the ICO’s regulatory radar.
- EU
Within the EU, the use of email-tracking technologies is generally governed by the ePrivacy Directive (2002/58/EC) in particular Article 5(3), as implemented into national law across EU Member States and enforced by local supervisory authorities. Because these tracking technologies typically involve the storing of, or access to, information on a recipient’s device, many EU regulators take a strict view of their use. This position has been reinforced by guidance from the European Data Protection Board (EDPB) (Guidelines 2/2023, adopted on 7 October 2024), which has made clear that URL and pixel-based tracking falls within the scope of Article 5(3) on a technology-neutral basis, irrespective of whether personal data is ultimately processed. As a result, opt-in consent is generally expected for any use of tracking technologies that is not strictly necessary to deliver a service expressly requested by the recipient, with even basic open-rate tracking commonly treated as in scope.
To date, there has been no enforcement action by EU Member State supervisory authorities that specifically targets the use of email-based tracking technologies. However, the legal position on paper remains demanding and leaves relatively little room for flexibility.
France provides a useful illustration of the direction of travel. In June 2025, the French data protection authority (CNIL) issued draft recommendations that would require a more granular approach to pixel-based email tracking. In particular, the draft proposed treating consent to receive marketing and consent to the use of tracking pixels as separate decisions, with a possible carve-out where only anonymized, high-level open-rate statistics are collected or where the pixel is used strictly for technical authentication/security functions. Controversially, the CNIL’s draft recommendations require that consent withdrawal must be retroactively honored. (I.e., pixels must be deactivated once consent has been withdrawn, even for emails which have already been sent.) In practice, this would generate significant operational and technical complexity and has been flagged as a key point of debate in responses to the consultation. The draft also contemplates an in-email mechanism allowing recipients to opt out of tracking. While the consultation process has now ended and no final recommendations have yet been published, the draft points toward a stricter and more structured regime in the medium term.
- United States
There is no federal statute that specifically regulates the use of email-tracking technologies. In challenging the practice, plaintiffs most often rely on the Electronic Communications Privacy Act (ECPA). They typically assert claims under Title I of ECPA (commonly known as the Wiretap Act), which prohibits the intentional interception of electronic communications, a term frequently litigated to require acquisition contemporaneous with transmission and without consent or other statutory authorization. Plaintiffs also invoke Title II of ECPA, the Stored Communications Act (SCA), which addresses unauthorized access to communications held in electronic storage on a covered facility. In many email-tracking technology fact patterns, however, the technology is characterized as triggering an image request that returns open or engagement data, making it difficult to establish the type of contemporaneous interception or unauthorized access required under these federal statutes.
California’s Invasion of Privacy Act (CIPA), particularly Section 631(a), has also been invoked in challenges to the use of email-tracking technologies. Although CIPA claims initially proliferated in the web-tracking context, plaintiffs have increasingly attempted to extend those theories to marketing emails containing tracking technologies. Under this approach, plaintiffs characterize the act of opening an email or clicking a hyperlink as a “communication,” and allege that a third-party email marketing vendor “intercepts” that communication by receiving engagement data in real time. Some complaints further contend that trackable URLs or embedded code reveal the “contents” of the communication, rather than merely routing or record information.
In Ramos v. The Gap, Inc. (N.D. Cal.), the court rejected these theories in the email-marketing context. The plaintiff alleged that Gap embedded tracking pixels and uniquely coded URLs in promotional emails and that its marketing vendor unlawfully intercepted communications when recipients opened or clicked those emails. The court dismissed the Section 631(a) claim, reasoning in part that engagement metrics such as open rates and click activity constitute information about a communication rather than protected “contents.” The court was also unpersuaded by arguments that a hyperlink click itself constitutes substantive content or that URL parameters exposed the underlying substance of the email. In addition, the decision underscored structural limits within Section 631(a), including the “party” principle, under which a participant in the communication generally cannot be liable for intercepting it, as well as the statute’s focus on acquisition of contents rather than ordinary analytics data generated in the course of message delivery and interaction.
While Ramos reflects an early, defense-favorable treatment of CIPA claims in the email-pixel setting, plaintiffs continue to test variations on these theories, often drawing analogies to web-tracking decisions addressing whether certain URL strings or user inputs can qualify as “contents.” As a result, CIPA exposure in the email context remains fact-dependent, turning on how courts characterize the data collected, the role of any third-party vendor, and whether the alleged acquisition can plausibly be framed as an interception of protected content rather than the collection of engagement metadata.
A similar dynamic is emerging under Arizona’s Telephone, Utility, and Communication Service Records Act (TUCSRA). TUCSRA restricts the unauthorized acquisition of “communication service records” maintained by a communication service provider, and plaintiffs have argued that email-tracking technologies impermissibly capture such records by collecting data about when, where and how an email is opened—including engagement metrics such as the time an email was accessed, the number of opens, whether it was forwarded or printed, and the type of device or server used. Early decisions have dismissed TUCSRA claims against retailers and other senders, reasoning that these entities are not “communication service providers” within the meaning of the statute and that email engagement data does not constitute protected service records. Some courts have also found a lack of Article III standing where plaintiffs allege only a statutory violation without concrete downstream harm. Nonetheless, plaintiffs continue to test these theories, and outcomes remain highly dependent on statutory interpretation, the characterization of the technology, and the forum in which the case is brought.
Against that litigation backdrop, day-to-day compliance obligations for email-tracking technologies are shaped less by wiretap doctrine and more by state privacy laws. Rather than prohibiting tracking technologies outright, these laws regulate how engagement data is classified, disclosed and operationalized within broader advertising and analytics ecosystems. The principal statutory risk typically arises where email engagement data is disclosed to third parties in a manner that could be characterized as a “sale” or “sharing” of personal information for targeted advertising purposes under state privacy laws (such as the California Consumer Privacy Act (CCPA) and analogous state laws). Under the CCPA, whether a disclosure constitutes a regulated “sale” or “sharing” turns on the role of the recipient and the contractual and technical constraints imposed on downstream use. Where an email service provider uses tracking technology-derived data solely to provide services to the sender without independently retaining, using, or repurposing that data for its own advertising purposes, the arrangement is more likely to qualify as a restricted “service provider” relationship. By contrast, if engagement data is made available to advertising networks or analytics partners for their own or joint advertising purposes, the disclosure may qualify as a “sale” or “sharing,” triggering notice and opt-out obligations. Regulators increasingly look beyond contract language to examine how data actually moves between systems, how it is combined with other identifiers, and how it is used in practice.
Recent enforcement activity in California highlights the regulatory focus. A 2026 CCPA settlement emphasized that opt-out mechanisms must be effective in practice, including across linked accounts, devices and services where personal information is used for cross-context behavioral advertising. The settlement also reinforces expectations around clear and conspicuous “Do Not Sell or Share” mechanisms, recognition of browser-based opt-out signals (such as Global Privacy Control), and user-interface design that does not fragment or undermine consumer choice.
Although that matter did not concern email-tracking pixels specifically, its implications are directly relevant where tracking technology-derived engagement data is combined with other identifiers and disclosed to advertising or analytics partners. If such disclosures qualify as “sharing” for cross-context behavioral advertising, businesses must ensure that opt-out rights are implemented comprehensively—not merely at device level, but across associated profiles and systems.
While regulators have not taken email-based tracking technology-specific action, the Federal Trade Commission has pursued significant cases against companies (particularly in the health sector) for sharing sensitive data via tracking technologies without adequate transparency or consent. This underscores the broader regulatory risk associated with opaque tracking practices, especially where sensitive categories of data are involved.
How One Uses Engagement Data Makes a Difference
Not all uses of email engagement data carry the same risk. Two common patterns are worth distinguishing:
a) Aggregated reporting
Many organizations use tracking technologies simply to generate high-level statistics such as overall open rates for a campaign or the relative popularity of links. Where the data is aggregated or truly anonymized, and not used to make decisions about specific individuals, there is a stronger argument that the intrusion into privacy is limited.
Some regulators have hinted that this kind of use may be treated more leniently, particularly if the metrics cannot reasonably be traced back to identifiable recipients. Nevertheless, transparency remains important, and it would be prudent to describe this kind of analytics in a privacy policy even where separate consent is not collected.
b) Segmentation and follow-up actions
The risk profile changes where engagement data is used to build profiles, segment audiences or drive follow-up communications at individual level. Examples include:
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- resending emails only to those who did not open a previous message;
- targeting offers based on which links a particular recipient clicked; or
- combining tracking technology-derived data with other systems to build behavioral profiles.
These activities clearly involve personal data processing and, in many jurisdictions, are more likely to require explicit, prior consent under ePrivacy-type rules, as well as enhanced transparency. They will also attract greater scrutiny if regulators begin to look closely at email-tracking practices.
A practical way to think about this is that transparency alone may be more defensible for limited, aggregated analytics, whereas individual-level targeting based on tracking technology-derived data sits at the higher-expectation, higher-risk end of the spectrum.
Practical Approaches to Compliance
There is no single model that works for every organization. Technical constraints, risk appetite, audience type and geography all play a role. In broad terms, organizations tend to converge around three approaches when thinking about consent.
a) Separate consent for tracking technologies
Under this approach, subscription or sign-up flows include a distinct consent mechanism for tracking technologies, separate from the consent to receive marketing emails. This is the approach that most closely matches the strict reading of ePrivacy and some of the emerging thinking of European regulators.
In theory, it offers strong legal defensibility and a clear audit trail. In practice, it can be challenging where, for instance, the email service provider’s platform does not allow pixels to be disabled for particular recipients. If a user agrees to marketing but withholds consent to tracking technologies, it may be difficult or impossible to honor that choice without suppressing emails entirely. Withdrawal of consent can also be hard to operationalize unless the technology stack is built with that in mind, particularly where consent is withdrawn only after tracked emails have been sent.
This model tends to suit organizations that are willing to invest in bespoke email infrastructure or that operate in sectors where regulatory expectations and reputational sensitivities are especially high.
b) Bundled consent to online tracking technology that includes website and mobile application and emails
Another option is to obtain a single, combined consent that covers both marketing emails and associated tracking technologies. This can be presented clearly on the sign-up or subscription form, supported by straightforward explanations in privacy notices and the emails themselves.
From a user-experience perspective, this can feel more honest than offering a choice that cannot truly be honored. It may be seen as a pragmatic compromise where the use of tracking technologies is technically unavoidable, provided that the language used is transparent about what is happening and why.
However, this is not perfectly aligned with the strict interpretation of separate, unbundled consent for distinct purposes, and organizations adopting this approach should understand that it sits in a gray area between letter-of-the-law compliance and operational reality.
c) Transparency-led approach without explicit tracking technology consent
A third approach is to rely on transparency without seeking specific consent to tracking technologies. Under this model, organizations:
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- acknowledge the use of tracking pixels in their privacy statement and, where appropriate, in cookie notices;
- include concise explanations in email footers describing what is collected and how it is used; and
- may suggest that recipients who prefer not to be tracked can disable images or take other steps in their email client.
This is the easiest option to implement, particularly where email platforms do not support fine-grained control and where the use of tracking technologies is limited to relatively low-risk analytics. It also aligns with what many recipients already experience in the market.
The trade-off is that this approach does not strictly meet ePrivacy and PECR requirements for prior consent to tracking technologies, and it may become more difficult to justify if regulators begin to focus actively on these email-tracking technologies. Organizations pursuing this path should view it as a risk-managed position rather than full compliance, monitor regulatory developments, and be prepared to adjust course.
Key Takeaways
Organizations deploying email marketing should not assume compliance by default, but should proactively verify how tracking technologies are deployed and what data they capture.
Where technical limitations exist within an email service provider’s systems, organizations will need to consider a risk-based approach to consent mechanisms and transparency, while factoring in jurisdiction-specific risks.
While email-tracking technology may indeed be invisible, from a regulatory and litigation standpoint they are anything but.