Guide
AI Email Tool Businesses: Cold Email, Inbox Agents and Email Marketing (25 Verified)
Email is old, boring and full of money. These AI email businesses show where.
Our directory has 25 businesses about email and inboxes with revenue verified on TrustMRR. The median makes $355 a month, a bit above the directory-wide $300 (study). 6 make $1,000 or more.
1. Inbox agents for one kind of user
- AI Brand-Deal Inbox Agent for TikTok Shop Creators: ~$15,590 MRR. An inbox built for one job: brand deals.
- AI Inbox That Turns Comments and DMs into Sales: ~$5,756 MRR.
- WhatsApp Automation, Team Inbox & Sales CRM: ~$2,190 MRR.
- AI That Finds Invoices & Receipts in Your Inbox: ~$836 MRR.
- Automated AI Inbox Management: ~$186 MRR.
- AI Agents That Manage Your Email: ~$9 MRR.
Lesson: “AI manages your whole inbox” earns little here. “AI handles one kind of email” earns more.
2. Cold email
- AI-Assisted Cold Email & LinkedIn Agency: ~$5,616 MRR. A service, not software.
- AI Job Search Agent with Founder Outreach: ~$1,306 MRR.
- Email Automation & Outreach Platform: ~$634 MRR.
- Lead Generation & Cold Email Automation: ~$309 MRR.
- AI Contact Finding & Email Outreach: ~$193 MRR.
More in our lead generation guide.
3. Email marketing for a niche
- Agent-First Email Marketing for Shopify: ~$537 MRR.
- AI Email Marketing for Indie Hackers: ~$520 MRR.
- AI Email Marketing for SaaS Companies: ~$490 MRR.
4. Small utilities
- Form Backend That Replies for You: ~$1,005 MRR.
- Inboxes for AI Agents: ~$119 MRR.
Honest catches
- Deliverability. Cold email tools live or die by spam filters; Gmail and Yahoo tightened bulk-sender rules in 2024.
- Laws. CAN-SPAM in the US and GDPR in the EU apply to cold outreach.
- Inbox access is sensitive. Expect Google’s security review if you read Gmail data.
Related: AI Newsletter Business, AI Customer Support Business.
Method
Payment-verified stacks on PrintCash with AI (October 29, 2026) whose title or tagline mention cold email, email outreach, email marketing or inboxes. Revenue from TrustMRR.
Every stack in this guide, side by side
This guide links 16 stacks. 16 have payment-verified revenue, 3 are rated Easy to build. The typical stack is about 80% automated, so plan on doing the rest yourself. "MRR" means monthly recurring revenue, what subscribers pay each month. Revenue figures come from each stack's source and date; tap a name for the full breakdown.
| Stack | Revenue (as reported) | Startup cost | Difficulty | Automated |
|---|---|---|---|---|
| AI Brand-Deal Inbox Agent for TikTok Shop Creators | ~$15,590 MRR; $16,974 verified revenue last 30 days (TrustMRR/Stripe, Oct 29, 2026) | Not disclosed | Hard | 80% |
| AI Inbox That Turns Comments and DMs into Sales | ~$5,756 MRR; $4,594 verified revenue last 30 days (TrustMRR/Stripe, Oct 27, 2026) | Not disclosed | Medium | 80% |
| WhatsApp Automation, Team Inbox & Sales CRM | ~$2,190 MRR; $2,909 verified revenue last 30 days (TrustMRR/Stripe, Oct 26, 2026) | Not disclosed | Medium | 80% |
| AI That Finds Invoices & Receipts in Your Inbox | ~$836 MRR; $791 verified revenue last 30 days (TrustMRR/Stripe, Oct 27, 2026) | Not disclosed | Easy | 85% |
| Automated AI Inbox Management | ~$186 MRR; $414 verified revenue last 30 days (TrustMRR/Stripe, Oct 27, 2026) | Not disclosed | Medium | 80% |
| AI Agents That Manage Your Email | ~$9 MRR; $39 verified revenue last 30 days (TrustMRR/Stripe, Oct 29, 2026) | Not disclosed | Medium | 80% |
| AI-Assisted Cold Email & LinkedIn Agency | ~$5,616 MRR; $6,728 verified revenue last 30 days (TrustMRR/Stripe, Oct 23, 2026) | Not disclosed | Medium | 50% |
| AI Job Search Agent with Founder Outreach | ~$1,306 MRR; $1,754 verified revenue last 30 days (TrustMRR/DodoPayment, Oct 23, 2026) | Not disclosed | Easy | 85% |
| Email Automation & Outreach Platform | ~$634 MRR; $636 verified revenue last 30 days (TrustMRR/Stripe, Oct 26, 2026) | Not disclosed | Hard | 75% |
| Lead Generation & Cold Email Automation | ~$309 MRR; $238 verified revenue last 30 days (TrustMRR/Stripe, Oct 25, 2026) | Not disclosed | Hard | 75% |
| AI Contact Finding & Email Outreach | ~$193 MRR; $177 verified revenue last 30 days (TrustMRR/Stripe, Oct 27, 2026) | Not disclosed | Hard | 75% |
| Agent-First Email Marketing for Shopify | ~$537 MRR; $577 verified revenue last 30 days (TrustMRR/Stripe, Oct 27, 2026) | Not disclosed | Medium | 80% |
| AI Email Marketing for Indie Hackers | ~$520 MRR; $552 verified revenue last 30 days (TrustMRR/Stripe, Oct 27, 2026) | Not disclosed | Medium | 80% |
| AI Email Marketing for SaaS Companies | ~$490 MRR; $490 verified revenue last 30 days (TrustMRR/Stripe, Oct 26, 2026) | Not disclosed | Easy | 80% |
| Form Backend That Replies for You | ~$1,005 MRR; $1,004 verified revenue last 30 days (TrustMRR/Stripe, Oct 28, 2026) | Not disclosed | Hard | 85% |
| Inboxes for AI Agents | ~$119 MRR; $128 verified revenue last 30 days (TrustMRR/Stripe, Oct 28, 2026) | Not disclosed | Hard | 85% |
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