While a client may suspect that double opt-in (DOI) is a strict General Data Protection Regulation (GDPR) requirement for subscribers in the UK and EMEA, the reality is more nuanced. GDPR does not explicitly mandate DOI. Instead, it focuses on the ability to prove consent for every recipient.
Key findings
No direct mandate: GDPR does not directly require double opt-in. The core principle is demonstrable consent.
Proof of consent: The regulation requires that consent be freely given, specific, informed, and unambiguous. Double opt-in is considered the easiest way to prove such consent.
German case law: Germany, in particular, has specific case law and data protection authority recommendations favoring DOI as a method to demonstrate consent.
Best practice: Despite not being a universal legal mandate, DOI is widely recognized and recommended as a best practice for email marketing across the EU.
Key considerations
Risk mitigation: Implementing DOI significantly reduces the business risk of sending unwanted emails and facing complaints or legal action, especially in regions with strict interpretation.
Deliverability impact: While not directly about deliverability, strong consent practices, like DOI, indirectly improve sender reputation by reducing spam complaints. This is vital for overall email deliverability.
Global application: For businesses operating globally, using DOI across all regions (including North America) provides a consistent and robust approach to consent management.
List quality: DOI ensures subscribers are genuinely interested, leading to higher quality email lists and better engagement metrics. This is one of the pros of using DOI.
What email marketers say
Email marketers generally agree that while double opt-in (DOI) isn't a hard legal requirement under GDPR, it's a highly recommended practice for building high-quality lists and mitigating compliance risks. Many adopt it even for non-EU/UK audiences due to its benefits.
Key opinions
Strong recommendation: Many marketers, including leading email service providers, advise enabling DOI for European audiences to ensure robust consent.
Beyond compliance: Even where not legally required, DOI is seen as a way to weed out uninterested or accidental sign-ups, improving overall list health.
Reduced complaints: Marketers find that DOI leads to fewer spam complaints because subscribers have taken an extra step to confirm their interest.
Proof of consent: It simplifies the process of proving explicit consent, which is a core GDPR tenet, making audits easier (as discussed in what impact GDPR had on marketing).
Key considerations
Global consistency: Applying DOI across all subscriber regions, even where not legally mandated (e.g., North America), provides a streamlined and secure approach.
Auditing consent: Marketers must ensure their systems are capable of logging and retrieving consent proof, regardless of whether DOI is used or not. Recording subscriber IP address is one such aspect.
Subscriber experience: While adding a step, the enhanced trust and relevance often outweigh the minor friction DOI introduces.
Local nuances: Awareness of specific country requirements or strong recommendations, such as those in Germany, is crucial even within the broader EU context.This remains a debated necessity.
Marketer view
Marketer from Email Geeks indicates that double opt-in is not a direct requirement under GDPR. However, they emphasize that the fundamental requirement is to be able to explicitly prove consent for every subscriber. Double opt-in simplifies this proof.
28 Apr 2021 - Email Geeks
Marketer view
Marketer from Email Geeks explains that their client, a retailer, uses double opt-in for subscribers in the EU and UK. This practice was adopted because the client believed DOI to be a mandatory requirement under GDPR, even though it serves customers mostly in North America.
28 Apr 2021 - Email Geeks
What the experts say
Industry experts concur that while GDPR does not explicitly mandate double opt-in, it remains the most reliable and safest method for demonstrating unequivocal consent. They emphasize that the focus should be on proving consent, and DOI provides the strongest audit trail.
Key opinions
Proof is key: Experts stress that the core of GDPR consent is the ability to prove it, and DOI makes this demonstration straightforward.
Safe choice: Confirmed opt-in (DOI) is consistently cited as a safe choice for businesses looking to ensure compliance and avoid issues.
Business risk assessment: Decision-making around DOI should involve assessing the likelihood of complaints and potential legal actions, considering email volumes and recipient type.
German specifics: There's an acknowledgment of Germany's specific legal precedents and data protection authority guidance that strongly advocate for DOI.
Key considerations
Adapting practices: Companies should review whether they need to adjust their opt-in processes for new subscribers or even re-confirm consent for existing lists based on risk appetite.
Avoid pre-checked boxes: GDPR requires active consent, meaning pre-checked opt-in boxes are generally not compliant. This aligns with the principles DOI reinforces (see opt-in button guidance).
Legal nuances: While not every EU country explicitly requires DOI, businesses should be aware of regional interpretations and judicial precedents that favor it.
Expert from Email Geeks explains that double opt-in is not a hard requirement under GDPR. However, they strongly advise that businesses must be able to prove consent for every recipient. They conclude that confirmed opt-in (DOI) is always a safe choice.
28 Apr 2021 - Email Geeks
Expert view
Expert from Email Geeks highlights that Germany has established case law supporting double opt-in as a valid method to prove consent. Additionally, German data protection authorities recommend using DOI for email subscriptions to ensure compliance.
28 Apr 2021 - Email Geeks
What the documentation says
Official GDPR documentation and related privacy guidance consistently emphasize the requirement for clear, affirmative consent for processing personal data, including for email marketing. While double opt-in is not named specifically, it's widely recognized as a robust mechanism to achieve this level of consent.
Key findings
Explicit consent: GDPR mandates that consent must be freely given, specific, informed, and unambiguous, typically via a clear affirmative action.
No DOI mandate: Review of GDPR text confirms no direct legal requirement for double opt-in.
Territorial applicability: GDPR applies to companies targeting European customers, regardless of their own geographical location.
Opt-in model: GDPR fundamentally requires an opt-in consent model, contrasting with opt-out models seen in some other jurisdictions.
Key considerations
Demonstrable consent: Businesses must be able to demonstrate that valid consent was obtained, including records of when and how it was given.
Recommended practice: Despite no explicit requirement, DOI is frequently recommended by privacy experts and authorities as the most secure way to meet GDPR's consent standards.
Specific country rules: While GDPR provides a framework, some EU member states, like Germany, have additional or stricter interpretations that effectively make DOI a de facto requirement.
Clear communication: Consent forms must clearly state what personal data is being collected and for what purpose, ensuring the subscriber is fully informed.
Technical article
Documentation from iubenda.com states that GDPR does not include a requirement for a double opt-in process. Nevertheless, it is widely considered a best practice in many countries, particularly within Germany and across the European Union, for ensuring robust consent.
1 Apr 2025 - iubenda.com
Technical article
Documentation from Securiti.ai clarifies that GDPR does not explicitly require double opt-in for consent compliance. It emphasizes, however, that GDPR demands consent to be unambiguous and affirmative, making strong consent mechanisms essential.