GMass vs Mailivery: Cold Email Platform vs Email Warmup Tool Comparison

GMass vs Mailivery: Cold Email Platform vs Email Warmup Tool Comparison

GMass is a cold email platform; Mailivery is an email warmup tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: cold email outreach on one side, email domain warming and deliverability on the other. This guide lays out what each vendor publishes.

The Quick Answer

GMass is a cold email platform for cold email outreach; Mailivery is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, GMass lists works inside gmail and unlimited emails, contacts, and campaigns, and Mailivery lists email warm up and inbox placement test.

Mailivery offers a lower entry point at $29/mo compared to GMass at $29.95/mo.

If your priority is sending campaigns that land in the inbox and generate replies, GMass is the one built for it; for building sender reputation and improving inbox placement, that is Mailivery. Many teams run one of each.

Understanding the Core Difference

GMass is Gmail-based mass email and mail merge platform with unlimited emails, campaigns, and contacts directly inside Gmail.

Mailivery is Email warm-up and deliverability tool that improves sender reputation by holding real conversations in your inbox through a peer to peer network of active mailboxes. Plans are priced on total daily warm-up volume and allow unlimited connected mailboxes, with inbox placement tests, blacklist monitoring and email verification included.

The two platforms take different approaches to solving the same core challenge.

Pricing Comparison

$29.95/moGMass entry plan

Standard

$29/moMailivery entry plan

Starter

GMass Pricing (as of September 2026)

Source: GMass Pricing

Mailivery Pricing (as of September 2026)

Source: Mailivery Pricing

Pricing Analysis

Mailivery offers the lower entry point ($29/mo vs $29.95/mo). Teams watching their budget will appreciate the savings, especially when starting out.

GMass offers 4 pricing tiers compared to Mailivery's 3, giving you more granularity as you scale.

Features Breakdown

GMass lists

• Works inside Gmail
• Unlimited emails, contacts, and campaigns
• Mail merge personalization
• Free email verification
• Automated follow-up sequences
• A/B testing
• and 4 more listed below

Mailivery lists

• Email Warm Up
• Inbox Placement Test
• Blacklist Monitoring
• Email Verification
• Custom Warm Up Templates
• Real email text & AI generated email content
• and 3 more listed below

GMass Key Features

• Works inside Gmail
• Unlimited emails, contacts, and campaigns
• Mail merge personalization
• Free email verification
• Automated follow-up sequences
• A/B testing
• Spam Solver deliverability tool
• Custom tracking links
• Inbox rotation
• API and Zapier access

Mailivery Key Features

• Email Warm Up
• Inbox Placement Test
• Blacklist Monitoring
• Email Verification
• Custom Warm Up Templates
• Real email text & AI generated email content
• Email scheduling & balancing to mimic natural behavior
• Peer2Peer interactions
• Automatic email reading and moving so that we don't jam your inbox

The two lists below are a diff of each vendor's own feature list by exact wording, so a capability both tools offer can appear on either side under a different name.

Listed only by GMass

• Works inside Gmail
• Unlimited emails, contacts, and campaigns
• Mail merge personalization
• Free email verification
• Automated follow-up sequences
• A/B testing
• Spam Solver deliverability tool
• Custom tracking links
• Inbox rotation
• API and Zapier access

Listed only by Mailivery

• Email Warm Up
• Inbox Placement Test
• Blacklist Monitoring
• Email Verification
• Custom Warm Up Templates
• Real email text & AI generated email content
• Email scheduling & balancing to mimic natural behavior
• Peer2Peer interactions
• Automatic email reading and moving so that we don't jam your inbox

Integration Ecosystem

GMass Integrations

GMass connects with: Gmail, Google Sheets, Zapier, Google Workspace.

Mailivery Integrations

Mailivery connects with: Gmail, GSuite, Microsoft 365, SMTP, SendGrid.

Shared Integrations

Both tools integrate with: Gmail.

Integrations listed only by GMass: Google Sheets, Zapier, Google Workspace.

Integrations listed only by Mailivery: GSuite, Microsoft 365, SMTP, SendGrid.

Use Case Recommendations

Best Fit for GMass

• Budget-conscious teams looking for an affordable cold email platform
• Teams that need a wide feature set (10 capabilities listed)
• Sales teams running high-volume outbound email campaigns
• Agencies managing multiple client outreach programs

Best Fit for Mailivery

• Budget-conscious teams looking for an affordable email warmup tool
• Organizations with complex tech stacks needing broad integration support (5 integrations)
• Teams launching new email domains for outreach
• Organizations recovering from deliverability issues

Feature Comparison Summary

Getting Started Checklist

1. Define your cold email outreach and email domain warming and deliverability requirements and monthly budget
2. Estimate your expected email sending volume and warmup email volume to find the right tier
3. List the integrations your team currently relies on
4. Sign up for free trials or demos of both platforms
5. Run a small test with each tool before making a commitment
6. Evaluate the onboarding experience and support quality

Final Thoughts

GMass serves the cold email outreach side of an outbound stack and Mailivery the email domain warming and deliverability side. Mailivery offers a more accessible entry point at $29/mo, while GMass starts at $29.95/mo. Your decision should weigh pricing against the specific features that matter most for your workflow.

Start with a trial of each to see which platform fits your team's daily process. The best tool is the one your team actually uses consistently.

Pricing and features verified as of September 2026. Visit GMass and Mailivery for current information.