10 Best Cold Email Tools for Agencies

Sujan Patel

October 3, 2025

Contents

Email is one of the most reliable channels for generating leads, with 61% of B2B decision-makers ranking it as their primary channel for outreach. For agencies, though, the challenge is a tough climb.

Instead of one campaign, you need to manage dozens across industries, juggle client expectations, and report on results that justify your fees. The pressure is on to send outreach that feels personal at scale while proving ROI with data clients can trust.

So in this post, we’ve rounded up ten of the best cold email tools built to handle the demands of agency life.

What Agencies Need in a Cold Email Tool Nowadays

Agencies live and die on cold email. You might be managing campaigns for a SaaS client in the morning, a DTC brand by lunch, and a local service provider by evening. That means a basic mail merge won’t cut it.

You need tools that can handle volume without losing the human touch, so look for:

Multi-client account management. When you’re sending on behalf of five clients at once, it’s easy to get wires crossed. A tool that keeps campaigns, domains, and analytics separate can save you from embarrassing mix-ups.
Advanced analytics and reporting. Clients want proof. If you can’t show open rates, reply rates, and meetings booked, they won’t see the value. Look for dashboards that make reporting easy to export and share.
High deliverability rates. Sending thousands of emails is useless if they end up in spam. Deliverability tools like domain warm-up and spam testing make the difference between campaigns that perform and campaigns that flop.
Integration with CRMs and project management tools. Every agency lives inside a stack of tools like HubSpot, Salesforce, and Asana. If your cold email tool doesn’t play nicely with them, you’ll waste hours exporting CSVs and updating pipelines manually.
Strong personalization options. Volume without personalization is just spam at scale. The best tools let you go beyond “Hi Cindy” and pull in details like job titles or company news that make your clients’ outreach stand out.

Top 10 Cold Email Tools for Agencies

Here are the top 10 cold email tools for marketing and lead generation agencies:

1. https://mailshake.com/Mailshake

G2 rating: 4.7 (338 reviews)

Capterra rating: 4.6 (135 reviews)

Mailshake is designed for teams that need cold email, calling, and LinkedIn outreach under one roof. Agencies can manage client campaigns with built-in deliverability tools like unlimited warmup, inbox rotation, and validation.

Personalization goes beyond “Hi [First Name],” and analytics let you track replies, meetings booked, and A/B tests across campaigns. Mailshake also integrates with Salesforce, HubSpot, and Pipedrive to keep reporting clean, especially when you’re juggling multiple clients.

Pricing:

Starter begins at $29/month
Email Outreach Plan starts at $49/user/month
Sales Engagement Plan is $99/user/month

2. Instantly.ai

G2 rating: 4.8/5 (3,802 reviews)

Agencies live or die on scale. Instantly’s pricing model is a game-changer: unlimited accounts included and no per-seat fees. That means you can run client campaigns under separate domains without ballooning costs. Automated warm-up ensures each client domain builds credibility before launch.

There’s also an AI sequence writer, which helps agencies spin up new campaigns quickly, while pipeline analytics show not just opens but actual revenue impact. With separate workspaces available, agencies can keep client data siloed while still managing everything under one roof.

Pricing:

Growth starts at $37/month
Hypergrowth starts at $97/month
Light Speed starts at $358/month

3. Reply.io

G2 rating: 4.6/5 (1,486 reviews)

Capterra rating: 4.6/5 (96 reviews)

Reply.io stands out as an all-in-one campaign engine that manages multichannel outreach, tracks every reply, and ties results back to the tactics that worked.

Instead of juggling separate tools for email, LinkedIn, calls, and SMS, your team runs it all from one dashboard. Channel-specific analytics make it easy to prove ROI to clients, while Jason AI saves hours by generating sequences and automating follow-ups.

Other useful features for agencies include:

86M+ B2B contact database with advanced targeting filters
Channel-specific dashboards that prove which tactics drive client replies and meetings
Integrations with HubSpot, Salesforce, Calendly, Slack, and more

Pricing:

Email Volume starts at $49/user/month
Multichannel starts at $89/user/month
Jason AI SDR starts at $500/month

4. Woodpecker

G2 rating: 4.5/5 (95 reviews)

Capterra rating: 4.5/5 (33 reviews)

For agencies, client reputation is everything. Woodpecker’s Agency plan is designed with this in mind: unlimited free warm-up, built-in recovery mode, and a white-label option to keep campaigns safe and on-brand.

The centralized dashboard lets you manage multiple clients while protecting every sender domain from spam penalties.

Key features for agencies include:

Unlimited warm-up and recovery tools on all plans
Condition-based campaigns with “if-then” rules
Free email verification via Bouncer
A/B testing for up to five email variants
Agency dashboard with multi-client management

Pricing:

Free trial, with 50 prospects/month
Starter plan begins at $29–$159/month, with 500 to 8,000 prospects/month
Growth plan starts at $188–$1144/month, with 10,000 to 80,000 prospects/month
Scale plan starts at $1354–10,312/month, with 100,000 to 1 million prospects/month
Max plan starts at $9,999/month with unlimited prospects

5. Saleshandy

G2 rating: 4.6/5 (659 reviews)

Capterra rating: 4.5/5 (125 reviews)

Agencies running large-scale campaigns need reach without limits. Saleshandy is built for high-volume cold email, offering up to 250,000 emails/month on its Scale plan. Its Agency Partner Portal gives you a dedicated dashboard to manage multiple clients while letting them track progress with view-only access.

To keep deliverability intact, Saleshandy includes inbox rotation, verification credits, and warm-up via TrulyInbox. While it lacks multichannel, its sequencing power (up to 26 steps and 26 A/Z test variants) makes it great for agencies that want reliable, high-capacity email outreach at scale.

Pricing:

Outreach Starter: ~$25/user/month
Outreach Pro: ~$74/user/month.
Outreach Scale: ~$149/user/month

6. Lemlist

G2 rating: 4.5/5 (265 reviews)

Capterra rating: 4.6/5 (388 reviews)

Marketing agencies need tools that scale across clients without juggling multiple dashboards. Lemlist delivers with a full-featured platform. You can source leads from its 450M+ database, create hyper-personalized emails with AI-generated icebreakers, and automate multichannel campaigns, including LinkedIn and calls.

Agencies can track every client’s performance with granular analytics and a unified inbox that brings together replies, making it easy to measure ROI and engagement.

You also get built-in deliverability tools like Lemwarm and inbox rotation to protect your clients’ sender reputations while sending at scale.

Pricing:

Email Starter: $59/user/month
Email Pro: $99/user/month
Outreach Scale: $159/user/month

7. Outreach.io

G2 rating: 4.3 (3,499 reviews)

Capterra rating: 4.4 (307 reviews)

Outreach.io’s deep Salesforce integration, AI prospecting, and robust analytics make it possible to monitor deal health, forecast revenue, and track team performance across clients.

The platform’s conditional sequences also help you automate responses based on prospect behavior, while multi-channel orchestration blends email, LinkedIn, and power dialing in a single workflow. There’s also a native Salesforce integration for data sync and reporting.

Pricing: Enterprise quote-based (~$100–$160+/user/month)

8. Mixmax

G2 rating: 4.6/5 (1,434 reviews)

Capterra rating: 4.6/5 (235 reviews)

Agencies managing multiple clients need a way to keep outreach organized without juggling dozens of tools. MixMax integrates email tracking, automated sequences, and embedded polls directly into Gmail, so you can monitor engagement and collect responses in one place.

The platform’s calendar sharing and automated follow-ups reduce scheduling friction and ensure every client interaction is timely. Integrations with CRMs like Salesforce or Pipedrive help you maintain a unified workflow, keeping all client data synced and accessible.

Pricing:

Free plan
SMB starts at $34/user/month
Growth starts at $65/user/month
Growth + CRM starts at $89/user/month
Custom plans for teams

9. Snov.io

G2 rating: 4.5/5 (456 reviews)

Capterra rating: 4.5/5 (215 reviews)

With Snov.io, you can manage prospecting, outreach, and pipeline tracking all in one place. You can capture leads with the Chrome extension, personalize emails using dynamic content and AI features, and automate follow-ups with guided drip campaigns. The integrated CRM also helps you track deals for multiple clients without juggling separate dashboards.

Key features for agencies include:

Credit-based prospecting to control how many emails you find and verify per client
Built-in email warm-up to protect your clients’ sender reputation from day one

Pricing:

Free plan comes with 150 credits/month
Starter starts at $39/month (1,000 credits)
Pro starts at $99 and goes up to $738/month (5,000 to 100,000 credits)
Custom Ultra starts at 200,000 credits, with custom pricing

10. Apollo.io

G2 rating: 4.7/5 (9,125 reviews)

Capterra rating: 4.5/5 (380 reviews)

Apollo.io helps marketing agencies build hyper-targeted lead lists from its 270M+ B2B database, filter by buying intent, company growth, or technology stack, and launch personalized email and call sequences for multiple clients.

You can track each client’s campaign performance, see which prospects engage, and use AI-assisted email writing to save time while keeping messaging relevant and tailored.

Pricing:

Basic plan starts at $59/user/month
Professional starts at $99/user/month
Organization starts at $149/user/month

Final Words

Cold email campaigns don’t scale on effort alone; they scale on systems that actually work. Agencies juggling multiple clients often feel buried in spreadsheets, inboxes, and half-tracked sequences. That’s where tools like Mailshake change the game.

Campaigns become organized, replies stop slipping through the cracks, and every outreach step feeds a clear, measurable process. The result is more meetings booked, more leads generated, and a repeatable workflow that grows with your agency.

If you’re still sending emails the old way, imagine what could happen when your outreach finally works at scale. Find out by booking a Mailshake demo today.