{"id":4062,"date":"2025-05-21T17:48:41","date_gmt":"2025-05-21T17:48:41","guid":{"rendered":"https:\/\/www.warmy.io\/blog\/how-to-increase-email-deliverability-in-the-uk-market\/"},"modified":"2025-05-21T17:48:41","modified_gmt":"2025-05-21T17:48:41","slug":"how-to-increase-email-deliverability-in-the-uk-market","status":"publish","type":"post","link":"https:\/\/www.warmy.io\/blog\/how-to-increase-email-deliverability-in-the-uk-market\/","title":{"rendered":"How to Increase Email Deliverability in the UK Market"},"content":{"rendered":"

Breaking into the UK market with email campaigns is both challenging and rewarding. There are many variables at work in the situation\u2014regional ISPs, UK laws\u2002and even a few cultural quirks.<\/span><\/p>\n

In the UK alone,<\/span> 8.3 billion (as of April 2024) emails<\/span><\/a> are sent each day, opening up vast potential for business growth. But a\u2002one-size-fits-all email plan won\u2019t cut it. So<\/span> what works in the US<\/span><\/a> to get your email delivered, may not be so successful in the UK. If tactics fail, your brand reputation could take\u2002a hit\u2014and those emails could find themselves in spam.<\/span><\/p>\n

What we mean by this is basically: if you want to succeed in email marketing in the UK, it\u2019s crucial to customize your approach. It must align with UK\u2019s technical requirements, legal landscape, and even audience behavior. In this guide, we\u2019ll explore steps designed to help you increase email deliverability in the UK.<\/span><\/p>\n

Understanding the UK email ecosystem<\/b><\/h2>\n

Before we jump right into specific deliverability tactics, let\u2019s take a look at what makes\u2002the UK email ecosystem different.<\/span><\/p>\n

GDPR, privacy, and consent<\/h3>\n

Since Brexit, the UK has maintained its own version of the<\/span> General Data Protection Regulation<\/span><\/a> known as the<\/span> UK GDPR<\/span><\/a>. This outlines what businesses do with personal data,\u2002such as email addresses or an email list, when they\u2019re collected and stored. Compliance with the UK GDPR is not optional. Not complying could lead to fines and damage to\u2002your brand if punished.<\/span><\/p>\n

Perhaps the most critical element of UK GDPR is securing consent using \u2018opt-in\u2019 before you start sending\u2002marketing emails to people. What does this mean? Do not rely on implied consent or pre-checked boxes. Clear, affirmative consent must be collected and properly documented.<\/span><\/p>\n

Regional ISPs and their spam filters<\/h3>\n

Then there is the fact that there are several large internet service\u2002providers in the UK, such as<\/span> BT<\/span><\/a>,<\/span> Virgin Media<\/span><\/a>, and<\/span> Sky<\/span><\/a>. Every ISP has their spam filters and own set of rules, levels, or requirements. This effectively makes achieving good email deliverability in the UK more complicated.<\/span><\/p>\n

Understanding these regional ISP behaviors is critical. What passes through one provider\u2019s filters may be blocked by another. To succeed in the UK, you need to monitor deliverability across all key ISPs and adjust your tactics accordingly.<\/span><\/p>\n

The technical essentials for UK deliverability<\/b><\/h2>\n

Successful email deliverability in the UK starts with a strong tech foundation. For example, properly setting up email authentication and choosing the right sending domain are critical steps that should not be skipped.<\/span><\/p>\n

Set up authentication correctly<\/h3>\n

Before your emails even land in UK inboxes, an email service providers needs to verify that your messages are genuine and approved. This verification\u2002process is based on email authentication protocols such as SPF, DKIM and DMARC.<\/span><\/p>\n

Q: What are SPF, DKIM, and DMARC? How do they impact deliverability?<\/span><\/i><\/p>\n

A: SPF, DKIM and DMARC are email authentication protocols that prove that your email is sent from approved servers and hasn\u2019t been manipulated, which helps to prevent spoofing\u2002and phishing. Configuring these correctly helps you secure your good name against spoofing or phishing, and it does wonders to reduce the chances of your emails ending up in spam rather than the inbox.<\/span><\/i><\/p>\n

SPF (Sender Policy Framework)<\/b>SPF acts like a whitelist. It specifies which mail servers are allowed to send emails on behalf of your domain. When a UK ISP is sent an email that purports to come from your domain, it consults\u2002your SPF record to determine if the sending server is permitted.<\/span><\/p>\n

DKIM (DomainKeys Identified Mail)<\/b>DKIM<\/span><\/a> adds a digital signature to your emails, which proves the message has not been tampered with during transmission. This cryptographic signature is verified by UK ISPs using a public key published in your DNS records. DKIM helps build trust by ensuring message integrity\u2014a strong signal for inbox placement.<\/span><\/p>\n

DMARC (Domain-based Message Authentication, Reporting & Conformance)<\/b>DMARC builds on SPF and DKIM by telling servers what to\u2002do with messages that don\u2019t pass the authentication. With DMARC,\u2002you can choose to quarantine, reject or monitor suspicious emails. It also includes reports to allow you to monitor your domain\u2019s email activity.<\/span><\/p>\n

\ud83d\udd16 <\/span>Related Reading:<\/b> The Warmy Research Team released a report on<\/span> Mastering Email Deliverability: The Modern Guide to Authentication and Inbox Warm-Up<\/span><\/a> which explores the relationship between authentication and deliverability.<\/span><\/p>\n

Use a UK-friendly sending domain<\/h3>\n

Older domains with a clean sending history are generally trusted more by UK ISPs. So if you are using a new domain, it will do you good to go through a warm-up period to build credibility. Avoid sending<\/span> large volumes<\/span> immediately, as this raises red flags.<\/span><\/p>\n

Read more here:<\/b> The Science and Process of Warming Up Newly Created Email Domains<\/span><\/a><\/p>\n

Choosing a country-specific domain like .co.uk can also help localize your brand and signal relevance to UK recipients and ISPs. Some UK ISPs give preference to emails sent from .co.uk domains because they align with local identity. However, a .com domain with a strong reputation and proper authentication can perform equally well. Consider your brand strategy and audience when selecting the sending domain. If you use a .com domain, adding clear UK localization in email content and headers can help bridge the gap.<\/span><\/p>\n

Strategies for improving UK email performance<\/b><\/h2>\n

Improving email deliverability in the UK requires a strategic approach to building trust, avoiding spam filters, and maintaining a strong sender reputation. Here are some solid strategies and best practices to improve email deliverability rate in the UK.<\/span><\/p>\n

Warm up your domain with UK focus<\/h3>\n

When sending an email marketing campaign from a new or inactive domain, warming up gradually is critical\u2014especially in the UK market where ISPs like Virgin Media and BT closely monitor new senders:<\/span><\/p>\n