The Dangers of Generative AI in Email Marketing 

Generative artificial intelligence (GenAI) is already a standard in the modern email marketing workflow, and we have the numbers prove it. According to the State of Email Report 2026, GenAI tools are now the most impactful AI use case in email marketing. 76% of marketers produce and send emails within three days—a dramatic shift from 2024 when 62% of teams needed two weeks or more to produce a single email. AI/ML application has also jumped to the number one skillset companies are prioritizing for hiring, surpassing 2025’s number one skill of content creation.

AI has made such a massive difference in a short period of time. But every industry-shaking tool has a flip side: the same tools that are helping email marketers send better campaigns are being weaponized by cybercriminals. For marketers, that creates a unique set of responsibilities to use AI ethically and protect your carefully-built programs.

Let’s look at the pros and cons of AI for email marketing.

Table of contents

• AI is transforming email
• The death of the obvious phishing email
• What GenAI cons mean for marketers
• How to use AI responsibly in email
• AI is a force for good—with guardrails

AI is changing email for better and for worse

For savvy marketers, AI is a great efficiency boost, speeding up tedious tasks and freeing up time for deep thinking and strategy.

"It’s not that AI is doing the work instead of me, it’s that AI is helping me do the work more productively, more efficiently. Maybe it’s an intern, maybe it’s more of a co-pilot."

Jeanne Jennings
Founder & Chief Strategist at Email Optimization Shop

Beyond email content creation, teams are using AI for segmentation, subject line testing, send time optimization, accessibility compliance, and deliverability improvements. As of early 2026, 28% of email teams have reached advanced AI adoption, meaning AI is deeply integrated into multiple stages of their email marketing workflows. These advanced adopters are 75% more likely to achieve ROIs above 45:1 from their email campaigns, and 28% more likely to deploy emails in under a day than early-stage AI adoption teams.

But that same speed and scale is available to anyone—including bad actors. Large language models (LLMs) have reduced the time needed to craft a convincing phishing campaign from hours to minutes. Now AI tools can generate hundreds of grammatically correct phishing emails that can fool just about anyone.

As Validity’s Senior Email Strategist, Rafael Viana, puts it, “Bad actors have that same superpower. They use AI to create polished, believable emails at massive scale. And frankly, a lazy marketer using that magic button could generate generic content that looks a lot like a spammer to those inbox algorithms. The stakes for trust have never been higher.”

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The death of the obvious phishing email

For years, typo-ridden subject lines, no personalization, and awkward greetings were all reliable identifiers for phishing emails. But that’s no longer the case. Today’s AI-generated versions are polished, contextually accurate, and often indistinguishable from real brand communications.

The result: phishing is at an all-time high. According to cybersecurity research, there was a 202% increase in phishing email volume in the second half of 2024 alone, and 82.6% of detected phishing emails now show signs of AI generation.

GenAI can:

• Mimic corporate writing styles.
• Reference real vendor relationships.
• Personalize greetings with accurate names and titles.
• Replicate the voice of a specific executive.

Combined with deepfake audio and video technology, bad actors can now construct multi-channel attacks that are extraordinarily difficult to detect. In one high-profile 2024 case, a finance worker at a multinational firm was deceived into transferring $25 million after attending a video call in which every face and voice was AI-generated.

According to CISA, more than 90% of successful cyberattacks start with a phishing email. When AI boosts the attacker’s ability to make those emails look real, the stakes for every organization—and every email marketer—go up significantly.

What the cons of GenAI mean for marketers

Email marketers occupy an interesting position in this landscape. We’re using the same class of tools as scammers, and subscribers know it. It has created a trust challenge that goes beyond security.

"Not everybody can sniff out AI. But when a subscriber gets that feeling that this might be an AI-generated email—that it doesn't read as expected from this brand—the brain has already made that judgment. AI could accidentally scale bad emails."

Beth O'Malley
Founder, CRM, Email & Marketing Specialist at astral

When using AI, it’s essential to keep a human touch through detailed review and editing so your brand maintains its identity—and to make sure all information is correct. Misleading subject lines, for example, now carry real legal risk, with multiple class action lawsuits already filed. AI makes it easier to generate clever, attention-grabbing subject lines at scale, but it can also overpromise with incorrect wording or even made up promotions.

There’s also a direct deliverability impact that is affecting inbox placement across the board. Validity’s 2026 Deliverability Benchmark Report documents how AI has made it easier for spammers to flood inboxes, making mailbox providers’ filters more sophisticated and harder for all senders to navigate. Luckily, bands that have invested time into building genuine subscriber relationships and have consistent email engagement will be the ones that stay out of the spam folder.

"Whether we use AI to amplify good or bad behavior doesn’t really matter at the end of the day. It’s a means to an end. We want senders to provide the best user experience to our mutual customers, and we want to provide the best user experience on top of that."

Marcel Becker
Senior Director of Product Management at Yahoo

AI is directly in the inbox

Rafael Viana said it best, “We are not just optimizing for spam filters anymore. We are optimizing for inbox AI.”

Validity’s Q1 2026 Marketer Survey notes that inbox optimization must account for the AI systems that decide what gets surfaced, summarized, or ignored. With tools like Gemini integrated into Gmail, subscribers are increasingly relying on AI to sort, summarize, and filter their emails.

Despite this, fewer than one-third of marketers currently have a strategic approach to optimizing for these AI-driven inboxes.

LitTip: Prep emails for AI-driven inboxes by using SEO-inspired strategies like semantic formatting, front-loading key information, and using inbox schemas like Gmail annotations.

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How to use AI responsibly in email

None of the cons we outlined means you should shy away from AI, but it does mean you should use it thoughtfully. Here’s how:

Be transparent with your subscribers

A simple “powered by AI” disclosure can go a long way in building trust. Consider updating your privacy policy to reflect how you use AI, and give subscribers the ability to control their exposure to AI-generated content through your preference center.

Keep humans in the loop

AI does not replace email marketers. Even with AI, human guidance and oversight is crucial—and so is adding in the human touch that AI lacks.

As Leah Miranda said, “There are some emails that are okay for an AI magic button. You can still add in that little twenty percent human sparkle for, say, a newsletter opener. But those types of emails are made for a magic button. You can train an AI really quickly.”

She continued to say, “If you are using AI to just write an email without investing the time to build it properly, you’re going to get crap out. Some people think AI is going to solve all their problems. It can—but you’re still going to have to invest in it.”

Focus AI where it matters most

When many marketers think about AI, they think about content output. While it’s very useful for that, there are other use cases that are arguably even better.

"Copy and design sit at the bottom of the email pyramid of what's important. What actually drives performance is the invisible work—the infrastructure, the data, the segmentation, the frameworks, understanding what's working."

Beth O’Malley
Founder, CRM, Email & Marketing Specialist at astral

Use AI to strengthen your foundations, like analyzing customer behavior and sorting customer data, not just speeding up email copy output.

Watch for bias in AI outputs

The quality of what you get from AI depends on what you feed it. Uploading great resources, data, and giving it guardrails will help you avoid getting poor outputs.

"AI will absolutely amplify performance, but it will just as quickly amplify the consequences of poor data hygiene. If your foundation isn't solid, AI doesn't hide the cracks. It exposes them."

Matt Gore
CTO at Validity

Protect your deliverability

Lean on tools like Litmus to test and QA your emails before sending, and use authentication protocols like DMARC and BIMI to verify your sending identity. These steps protect your subscribers from spoofing attacks that impersonate your brand, and signal to mailbox providers that you’re a trustworthy sender. Microsoft, Yahoo, and Gmail now require SPF, DKIM, and DMARC compliance for senders of more than 5,000 emails per day.

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Educate your subscribers

Make sure your subscribers know what real communications from your brand look like. Proactive communication reduces the risk that a convincing AI-generated impersonation will succeed. Try using consistent email templates, messaging, email “from” addresses, and implement BIMI.

Generative AI is a force for good—with guardrails

The overall use of AI in email marketing is very positive. We know that advanced AI adopters produce emails faster, personalize better, achieve higher ROI, and are more likely to follow accessibility standards. In other words, strategic AI use really does pay off.

Leah Miranda offered a great perspective that, “It’s not that AI is doing the work instead of me. It’s that AI is helping me do the work more productively, more efficiently.”

AI is a useful tool for connecting with subscribers. Used thoughtfully, it helps you produce relevant emails faster and analyze results better. Used carelessly, it risks losing the trust that makes email worth sending in the first place.

Ann Handley sums it up beautifully by saying, “The power of email has not changed, but the conditions around it have. Your pacing, your relevance, your humanity—these are now the difference between being seen and being skipped.”

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This article was originally published on validity.com. It was refreshed using AI and was reviewed and edited by Lindsey Hiner.

Lindsey Hiner

Lindsey is a Sr. Content Marketing Manager at Validity.