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Effective strategies for optimizing email deliverability and maximizing engagement are crucial for holiday campaign success.
In part II of our series on email deliverability, we introduced recipient actions that indicate positive email engagement and outlined three warning signs of potential deliverability issues.
In today’s installment, we share five best practices and five essential tips for achieving deliverability that drives email campaign success.
ISPs assess whether your emails are wanted based on recipient engagement. Crafting content that resonates with them is fundamental to driving interaction and ensuring email deliverability.
From the subject line and preview text to images and messaging, all the content should be targeted to each specific segment. This will increase the likelihood that they will engage and that the ISP will be confident that you know your database well.
Here are some strategies to enhance engagement:
Planning your sending patterns based on how recipients engage with your emails—not your website, brand, or product—is crucial for improving deliverability. Overwhelming subscribers with too many messages increases their likelihood of complaining, which can lead spam filters to flag your emails as potentially spam-like content.
Additionally, ensure your users receive messages at the frequency they expect and want. When increasing send volumes, do so incrementally, at no more than twice the typical rate. ISPs monitor consistent trends in email sending volumes over time, and a sudden spike can trigger red flags.
When an ISP like Gmail defers an email, it means it suspects poor sending behaviors and has started slowing down delivery to assess engagement patterns.
While occasional deferrals can be expected, a sudden increase may indicate a deeper issue. For time-sensitive campaigns like Black Friday or Cyber Monday, this can be detrimental, as it significantly impacts revenue.
Regularly cleaning and validating your email database will mitigate deferral risk and improve deliverability.
Adhering to standards and regulations is imperative. Let’s take DMARC (Domain-based Message Authentication, Reporting, and Conformance) as an example.
DMARC is an email authentication, policy, and reporting protocol that adds a vital layer of protection against unauthorized use. It instructs receiving servers on how to handle messages that fail authentication checks, thereby reducing the risk of phishing attacks and safeguarding brand reputation.
If marketers don’t have DMARC in place, they won’t be able to display their logos in subscriber inboxes, which negatively impacts the branding effort and ultimately affects engagement.
Poor list hygiene leads to blacklisting, repeated spam trap hits, and a decrease in inbox deliverability.
Marketers should regularly evaluate how they acquire subscribers and maintain list hygiene. This practice involves removing invalid addresses and suppressing non-engaging users to prevent deliverability issues.
Adopting regular list hygiene practices—monthly, bi-monthly, or quarterly—will enhance deliverability and engagement performance.
In addition to the five best practices, these five essential tips will also help you improve email deliverability:
With ISPs closely monitoring your sending behavior, following the five email deliverability best practices —engaging content, frequency management, deferral monitoring, adhering to standards, and rigorous list hygiene— will help you safeguard your deliverability.
Combined with essential tips like implementing double opt-in and responding swiftly to email deliverability alerts, you’ll be well-equipped to navigate challenging holiday efforts, maximize inbox placement, and boost campaign success.
To learn how Optimove can help you improve email deliverability rates and increase engagement, contact us to request a demo.
Exclusive Forrester Report on AI in Marketing
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Writers in the Optimove Team include marketing, R&D, product, data science, customer success, and technology experts who were instrumental in the creation of Positionless Marketing, a movement enabling marketers to do anything, and be everything.
Optimove’s leaders’ diverse expertise and real-world experience provide expert commentary and insight into proven and leading-edge marketing practices and trends.


