Email deliverability across APAC: Navigating a diverse digital landscape

If you're aiming to craft a unified email strategy that spans from Tokyo to Jakarta, you'll quickly realise that APAC is not just a region—it's a complex mosaic. Asia-Pacific encompasses some of the world's most technologically advanced markets right alongside rapidly growing economies, and sports email outreach rules that differ dramatically from country to country. For marketers seeking to expand their email efforts across APAC, this complexity affects more than just compliance; it has significant, tangible effects on deliverability.

Read on for a practical orientation for marketers and deliverability professionals who are either expanding into APAC or tightening up their existing programs across the region. It won't cover every nuance in every market—that would take a textbook—but it will give you a solid foundation for thinking strategically about the region.

Disclaimer: This piece does not constitute legal advice. Regulatory requirements change, and you should always work with qualified legal counsel in each market. This article speaks to how these regulatory environments interact with deliverability, and what that means for your program in practice.

The regulatory landscape: Not one law, but many

Unlike Europe, where the GDPR provides a broadly unified framework, or the United States, where CAN-SPAM sets a federal baseline, APAC operates under a patchwork of national laws with meaningfully different approaches to consent, data handling, and enforcement. Understanding which regime applies to your sends—and how—is the starting point for any compliant and deliverable program.

• Japan operates under the Act on Regulation of the Transmission of Specified Electronic Mail (commonly referred to as the Specified Electronic Mail Act), which requires opt-in consent before sending commercial emails. Japan is notable for having some of the most sophisticated and privacy-conscious email users in the world, and ISPs like NTT Docomo, SoftBank, and au (KDDI) maintain strict filtering systems. Spam complaints in Japan have a disproportionately negative impact on sender reputation, so list hygiene and engagement segmentation are non-negotiables if Japan is a meaningful part of your audience.
• Australia is governed by the Spam Act 2003, which requires express or inferred consent, a clear sender identification, and a functional unsubscribe mechanism. The Australian Communications and Media Authority (ACMA) actively enforces this legislation, and Australian consumers are generally quick to use spam report functions. Notably, "inferred consent" in the Australian context has a relatively broad definition compared to some other markets—but that doesn't mean it should be relied upon as a substitute for genuine engagement. If your Australian open rates are deteriorating, treat it as a warning sign, not just a metrics issue.
• Singapore's Personal Data Protection Act (PDPA) includes the Do Not Call provisions and broadly requires opt-in consent for marketing communications. Singapore is also home to a highly engaged and tech-savvy email audience, which means that above-average engagement benchmarks are reasonable to expect—and below-average rates should prompt investigation.
• India presents a different kind of complexity. The Telecom Regulatory Authority of India (TRAI) has historically focused more on SMS and voice communications. Still, India's Digital Personal Data Protection Act (DPDPA), which was enacted in 2023, introduces stricter data-handling obligations. India is also one of the largest and fastest-growing email markets in the world by volume, and it is served by a mix of global providers (Gmail dominates) and local ISPs. The sheer scale of India means that deliverability issues there can have outsized program-wide effects.
• Southeast Asia, covering markets like Indonesia, Malaysia, Thailand, Vietnam, and the Philippines, is the most varied part of the picture. Regulatory maturity varies significantly across these markets, but that doesn't mean the risk of deliverability is lower. Gmail's spam filtering is provider-side and applies universally; a poor sender reputation earned in one market will follow your IP and domain wherever you send.

ISP nuances: APAC is not all gmail

One of the most common mistakes marketers make when approaching the APAC region is assuming that optimizing for Gmail covers most of their audience. In many Western markets, that assumption is more or less reasonable. In APAC, it is not.

Japan, in particular, is a market where mobile carrier email addresses remain widely used. Addresses ending in @docomo.ne.jp, @softbank.ne.jp, @au.com, and similar domains are common—especially among older demographics—and these providers have their own filtering logic that does not mirror Gmail's behaviour. Carrier email in Japan is notoriously strict: Image-heavy emails, URL-heavy footers, and certain authentication failures can trigger blocking that you simply won't see replicated in your Gmail metrics. If you're sending to Japan and only monitoring Gmail performance, you may be missing a significant deliverability problem.

In South Korea, Naver and Kakao Mail are major providers. In China, where most global senders are not actively operating due to broader internet restrictions, domestic platforms like NetEase (163.com, 126.com) and Tencent Mail (qq.com, foxmail.com) dominate. For brands that do operate in China, it is worth knowing that authentication requirements and content filtering are significantly more aggressive than elsewhere, and a dedicated infrastructure for China sends is often advisable.

Across Southeast Asia, Gmail and Outlook dominate consumer email, but local mobile operators and webmail providers still hold share in markets like Indonesia and Vietnam. The practical advice here is to segment your reporting by domain, not just by geography. Aggregated metrics will mask provider-level issues that need to be addressed separately.

Authentication: The non-negotiable foundation

If there is one universal truth across every APAC market, it is that strong email authentication is the floor, not the ceiling. SPF, DKIM, and DMARC are baseline requirements across the region, and Google and Yahoo's 2024 bulk sender requirements—which mandate DMARC at p=none at a minimum—have raised the bar globally, including for APAC sends.

For senders operating across multiple APAC markets with different sending domains or subdomains, DMARC alignment can quickly become complicated. If your marketing sends in Japan, use a different subdomain from the one used for your transactional sends in Singapore. Ensure that each is properly authenticated and that your DMARC policy covers both. Gaps in authentication are not just a compliance risk—they are a deliverability risk and one of the first things ISPs look at when evaluating a sender's legitimacy.

Practical considerations for scaling across APAC

Beyond compliance and infrastructure, a few operational considerations tend to catch marketers off guard when scaling email programs across the region.

• Time zone management matters more than you think. APAC spans UTC+5:30 (India) to UTC+12 (New Zealand), a time zone range of nearly 7 hours. Sending a campaign at a single scheduled time means that some portion of your audience will receive it in the middle of the night—and off-hours sends typically correlate with lower engagement, which in turn affects your sender reputation over time. Building time-zone-aware sending into your program architecture is worth the investment.
• Engagement windows vary by market. The "sweet spot" for email engagement in Japan differs from that in Australia, which in turn differs from that in India. If you are using a one-size-fits-all sending cadence across APAC, you are almost certainly leaving engagement—and deliverability performance—on the table.
• List hygiene is a regional exercise, not a global one. An email address that hard-bounced in one market should be suppressed globally, but engagement-based suppression should be evaluated on a market-by-market basis. In Australia, an address that hasn't opened in 12 months may warrant suppression; the same threshold applied in a market where email open tracking is commonly blocked could lead you to suppress an active audience incorrectly.

Final thoughts

APAC is one of the most exciting and complex email markets in the world. The regulatory diversity, the ISP fragmentation, and the sheer range of consumer behaviors across the region mean that a single global email strategy will almost always underperform a thoughtfully localized one. The good news is that the fundamentals—strong authentication, genuine consent, rigorous list hygiene, and engaged audiences—hold across every market. Get those right, build in the market-specific nuances on top, and your APAC program will be on solid ground.

Interested in learning more about how Braze supports email deliverability across global markets? Explore our Braze Deliverability Services or reach out to your Braze Deliverability Expert.