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AI Email Subject Lines


Using machine learning, AI Email Subject Lines are dynamically generated subject lines built to resonate with individual recipients, thereby improving open rates and overall engagement. 

What are AI Email Subject Lines? 

An email subject line can inspire interest and trust from targeted leads. It can also be the reason your email gets deleted instantly.  

AI email subject lines tend to hit the mark. How?  

  • AI technology can quickly analyze data such as recipient behavior, industry trends, and keyword interests. This machine learning enables AI to craft subject lines that are most likely to resonate with your target audience. 
  • With tools like 6sense’s AI Email Assistant, you can create personalized and engaging subject lines tailored to each recipient’s unique interests and preferences.  
  • AI technology can also adapt to user engagement and feedback over time, continuously optimizing subject lines to improve open rates and overall email engagement. 

We’ll show you how it works with some examples.  

The Performance Impact of AI-Driven Subject Line Optimization 

AI’s ability to personalize and craft engaging email subject lines makes it powerful. Here are some recent statistics on email subject lines that show why:   

  • 69% of email recipients will report spam based on the email subject line. 
  • 47% of email recipients will open an email based on the subject line alone. 
  • Email open rates increase by 50% when subject lines are personalized. 

However, manually personalizing each subject line can be tedious and time-consuming. Most sales and business development reps simply don’t have the time.  

This is where AI steps in, effortlessly handling the task of email personalization while ensuring consistency and scalability. 

Here’s how it works with 6sense’s AI Email Assistant.  

Crafting AI Email Subject Lines with 6sense 

By harnessing the power of 6sense’s AI Email Assistant, you can craft subject lines that go beyond basic personalization capabilities offered by traditional email marketing automation platforms

Tailored Subject Lines for Maximum Impact 

Powered by machine learning algorithms, AI Email Assistant can analyze industry trends, an account’s keyword interests, and your leads’ individual preferences and behaviors to tailor subject lines to each recipient. 

For example, imagine you work for a cybersecurity solutions company.  

If one lead is interested in cybersecurity solutions for data encryption, the AI might craft a subject line like “How to Secure Your Data with Advanced Encryption.”  

If another lead shows more interest in your web pages on threat detection, the generated subject line might be “Essential Info for Early Threat Detection.” 

Email Personalization at Scale 

AI Email Assistant also makes crafting diverse, creative, and tailored email subject lines easy. You just need to provide a few instructions when drafting your email prompts.  

For instance, you might request, “Keep the subject line concise, use the keyword data encryption, and use title case.” 

The AI will then consider your instructions, along with other relevant data, to generate a unique subject line that captures the attention of each lead or prospect. 

See it in action. Book a demo.  

Continuous Optimization Through Feedback 

As recipients engage with your emails, AI Email Assistant monitors their interactions, including which messages are opened and read. 

If the AI notices that certain subject lines consistently generate higher open rates, it learns to prioritize similar styles or keywords in future subject line generation. 

This invaluable feedback loop allows the AI to refine and optimize subject lines over time, increasing their effectiveness and improving email engagement. 

Best Practices for AI Email Subject Lines 

6sense’s AI Email Assistant includes a library of email marketing prompts covering various topics like product updates, webinar follow-ups, and lead nurturing sequences.  

Each prompt includes instructions for crafting relevant, compelling email subject lines that grab the reader’s attention and encourage them to open your emails. 

But if you want to provide your own instructions on how the AI should craft your email subject lines, we recommend following these best practices.  

Avoid Questions 

While posing a question might initially appear enticing, our studies reveal that starting your email subject line with a question may not yield the desired results.  

In fact, emails with question-based subject lines have response rates nearly half that of non-question subject lines, as found in our research (1.2% vs. 2.91%). 

Use Title Case 

Our findings suggest that using title case in your email subject lines, where all major words begin with a capital letter, can significantly boost response rates. Subject lines in sentence case resulted in lower engagement levels. 

Be Concise 

Short subject lines, ranging between 4 to 12 words, tend to outperform longer counterparts.  

Keeping subject lines concise and easy to read also ensures mobile device optimization, as many recipients may check emails on smartphones or tablets. 

Create Urgency 

Incorporate time-sensitive language or limited-time offers into your email subject lines to evoke a sense of urgency and prompt immediate action.  

Phrases like “Last Chance,” “Ending Soon,” or “Don’t Miss Out” can encourage recipients to open your emails promptly. 

Optimize with A/B Testing 

Utilize A/B testing to experiment with different variations of subject lines, content, and design elements in your emails.  

Analyze the performance metrics to identify what resonates best with your audience and refine your AI email marketing strategy accordingly. 

Measuring the Impact of AI Email Subject Lines 

With AI, you can quickly analyze vast amounts of data to identify patterns and trends in subject line performance. This aids in quickly A/B testing new campaign tactics to drive pipeline growth.  

By drawing from a wealth of account data available through 6sense, AI Email Assistant, can help quickly personalize email subject lines to individual recipients’ interests and behaviors at scale.  

As Rich Fong, Senior Manager of Sales Development at Vendavo, says, “An SDR can’t do the research and personalization for everyone engaging with us. Conversational Email helped us bridge that execution gap.”  

Vendavo recently used Conversational Email, a tool within the AI Email Assistant platform, to help generate $3.3M in pipeline

The Evolution of Email Subject Lines with AI 

AI email marketing tools will continue transforming how marketers approach everything from crafting personalized subject lines to optimizing email campaign performance. 

Use AI to ensure your email subject lines stand out in crowded inboxes and entice your leads and prospects to engage with your offers.  

See AI Email Assistant in Action 

Want to elevate your email marketing strategy and unlock the full potential of AI? Book a personalized demo of 6sense’s AI Email Assistant. 

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