In an era where our inboxes are flooded with promotional emails, crafting a subject line that grabs attention—and compels someone to click—can make or break your outreach success. For SaaS companies in particular, earning high open rates is crucial to filling your sales pipeline with qualified leads. But how do you consistently surpass the 50% open-rate mark?
Your subject line is often your only shot at convincing a prospect to open your email.
SaaS leaders, Heads of Sales, and Heads of Marketing receive hundreds of emails daily—generic messages are quickly deleted.
Studies show that personalized subject lines can boost open rates by up to 20%, but achieving true one-to-one customization is time-consuming without automation.
Tie your subject line to your prospect’s job role or a problem you know they have.
E.g. “Boost Your Demo Bookings by 33% – Here’s How”
Include clear numbers or references so readers know exactly what they’re getting.
E.g. “This 5-Step Framework Saved Us 5 Hours a Week”
Keep subject lines under 60 characters when possible—mobile previews cut off anything longer.
E.g. “Need More MQLs?”
Pique interest by hinting at what’s inside without revealing everything.
E.g. “One Tweak That Doubled Our Trials”
Focus on a single element (e.g., length, tone, or personalization token) per test to see which version resonates.
Split your list into two groups with similar characteristics to get accurate results.
Most email tools track opens. Check your results after a statistically significant sample (e.g., 100+ sends per variation).
Use insights from each test to refine your approach. Keep testing, even if you’re already hitting high open rates—prospect behaviors evolve.
Dynamically insert relevant information (e.g., company size, job role, last visited page on your site) into subject lines and email bodies.
Combines lead identification, enrichment, and email outreach—no more juggling separate platforms.
On average, teams leveraging Knock2 report double-digit reply rates and more demos booked.
Connect directly with your CRM (HubSpot, Salesforce) and Slack for real-time notifications.
Book a Demo and discover how to automate personalized subject lines and emails at scale.
