Best AI Tools for Email Marketing: 10 Startups to Know
May 12, 2025
AI is shaking up every part of marketing — but email marketing? That's where it’s quietly making the biggest leaps. Instead of just generating copy, these startups are helping teams personalize better, test faster, and drive real business growth.
We’ve rounded up 10 AI startups that email marketers, SaaS companies, and tech brands should have on their radar.
1. Smartlead — Running Personalized Cold Outreach
Smartlead automates cold email sequences across multiple inboxes. It personalizes messages, rotates senders to avoid deliverability issues, and tracks campaign health over time.
🧠 Why it matters: Building outbound at scale is tricky — you can burn domains or hurt your sender reputation fast. Smartlead helps teams grow outreach programs without putting email health at risk.
2. Lavender — Making Email Copy Smarter (and Faster)
Lavender acts like a writing coach inside your inbox. As you draft emails, it suggests edits to improve clarity, fix tone mismatches, and boost the chances of a reply. It even predicts how your email will perform.
🧠 Why it matters: A small change in wording can mean the difference between getting a reply — or getting ignored. Lavender makes every email sharper, without slowing you down.
3. Instantly.ai — Running Multichannel Cold Campaigns
Instantly.ai helps teams run cold email campaigns at scale, automating everything from inbox warming to A/B testing. It also tracks deliverability across different domains and sends.
🧠 Why it matters: Cold outreach is about consistency as much as creativity. Instantly reduces the manual overhead, helping marketing and sales teams focus on the quality of their messages — not the mechanics.
4. Mailmaestro — Writing Full Emails from Short Prompts
Mailmaestro lets you turn a few bullet points or a short prompt into a ready-to-send email draft. It adapts tone and style based on your needs — whether you're writing to a prospect, a customer, or a teammate.
🧠 Why it matters: Writing from scratch is a hidden time drain. Mailmaestro saves hours across teams, helping them stay responsive without getting bogged down in drafts.
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Get In Touch5. Apollo.io — AI-Powered Prospecting and Email Automation
Apollo.io helps SaaS and tech companies find the right prospects, automate personalized email sequences, and optimize send times using AI insights. It connects outreach with CRM data to create faster, smarter growth campaigns.
🧠 Why it matters:
Finding the right audience is half the battle. Apollo makes outbound smarter — from targeting and messaging to tracking real engagement.
6. Seventh Sense — Optimizing Email Send Timing
Seventh Sense uses machine learning to figure out when each person on your list is most likely to open and engage with emails. It then schedules sends at the optimal time for every contact.
🧠 Why it matters: Great emails won’t matter if they land at the wrong time. Seventh Sense helps lift open and reply rates by simply sending smarter.
7. Rasa.io — Composing Smart Email Newsletters
Rasa.io automatically curates and personalizes newsletter content for each subscriber based on their interests and behaviors. No manual content sorting needed.
🧠 Why it matters: When newsletters feel relevant, subscribers stay engaged longer. Rasa helps teams offer real value — not just another email blast.
8. Superhuman — Speeding up Email Workflows
Superhuman is a premium email client designed to cut down the time you spend in your inbox. It uses AI to predict next actions, suggest responses, and prioritize important conversations.
🧠 Why it matters: Fast communication is a competitive advantage. Superhuman gives busy marketers and founders back precious hours each week.
9. Salesforge — Сreating Hyper-Personalized Emails
Salesforge combines AI writing with live research to create highly personalized cold emails. It pulls real-time data about prospects and adjusts messaging dynamically.
🧠 Why it matters: Cold emails that feel generic don't convert. Salesforge helps teams send outreach that feels personal — at a speed manual research can’t match.
10. Inboxbooster — Improving Deliverability with AI
Inboxbooster identifies issues that could send your emails to spam — things like wording, timing, or domain health — and offers step-by-step fixes before you hit send.
🧠 Why it matters: Good deliverability isn’t a “nice to have” — it’s a growth lever. Inboxbooster makes sure your campaigns actually reach real inboxes, not just filters.
FAQ: Best AI Tools for Email Marketing
1. What are the best AI tools for cold email outreach?
Smartlead, Apollo.io, and Instantly.ai are some of the best AI tools for managing and scaling cold outreach. Smartlead automates large-scale cold email campaigns while protecting deliverability. Apollo.io helps teams find the right prospects and connect outreach to CRM data. Instantly.ai simplifies multichannel outreach and inbox management.
2. What are the best AI tools for writing emails?
Lavender and Flowrite stand out for improving email quality. Lavender offers real-time writing suggestions to boost clarity and reply rates, while Flowrite helps draft full emails quickly from short prompts.
3. Which AI startups help with cold email personalization?
Salesforge and Rasa.io specialize in AI-driven personalization. Salesforge builds fully personalized cold emails using real-time prospect data, while Rasa.io curates personalized newsletters for each subscriber based on their interests and behavior — helping teams deliver more relevant content consistently.
4. What are the best AI tools for optimizing email engagement and deliverability?
Seventh Sense and Inboxbooster are top choices. Seventh Sense optimizes send times based on user behavior, and Inboxbooster detects and fixes deliverability issues before campaigns go live.
5. How do I choose the right AI email marketing tool for my team?
Focus on your main bottlenecks. Need to scale outreach? Look at Smartlead, Apollo.io or Instantly.ai. Want faster, sharper writing? Try Lavender or Flowrite. Need better personalization? Use Salesforge or Rasa.io. Worried about deliverability or timing? Go with Inboxbooster or Seventh Sense. If you want faster daily email handling, Superhuman is the best pick.
Takeaways
- For Cold Outreach Management: Apollo.io, Smartlead and Instantly.ai help teams automate, scale, and monitor personalized cold email campaigns across multiple inboxes.
- For Email Writing and Content Creation: Lavender and Flowrite improve email quality and speed — offering real-time writing tips or drafting full professional emails from short prompts.
- For Personalization and Engagement: Salesforge and Rasa.io automate personalization — from highly customized cold emails to newsletters tailored to each subscriber’s interests.
- For Timing, Deliverability, and Workflow Optimization: Seventh Sense optimizes send timing for better engagement, Inboxbooster protects campaigns from deliverability issues, and Superhuman speeds up daily email handling for busy teams.
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