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What is mailr.io?

Mailr.io is a powerful tool designed for managing high-volume cold emailing, allowing users to send more than 10,000 emails each day within a 72-hour timeframe. By leveraging pre-warmed Microsoft servers located in the US, it facilitates immediate email distribution while maintaining a strong inbox reputation from the very beginning. Each domain is supported by its own dedicated Microsoft tenant in the US, which significantly improves deliverability and provides user isolation. The platform incorporates a warmup phase that lasts three days, with overall setup taking 72 hours. On the initial day, users can dispatch 700 emails per domain, with the potential to escalate this number to 1,000 emails daily by the end of a two-week period. Mailr.io can support up to 99 Outlook inboxes for each domain and integrates smoothly with various sending tools, ensuring that all inboxes come pre-configured with warmup settings and sending limitations. Furthermore, it features an inbox-level bounce rate tracker that continuously monitors each inbox, swiftly deactivating or replacing those that show high bounce rates to protect the domain’s reputation. This extensive strategy not only boosts email deliverability but also simplifies the process of managing large email campaigns, making it easier for users to optimize their outreach efforts. Through its innovative features, mailr.io stands out as a comprehensive solution for effective cold emailing.

What is Ballast?

Ballast is a web-based solution tailored for cold emailing, aimed specifically at teams that focus on personalized one-on-one outbound strategies utilizing their own email accounts. The platform allows users to seamlessly connect with services like Google Workspace, Gmail, Microsoft 365, or any other SMTP/IMAP services, while also enabling the import of leads and the creation of multi-step sequences that include personalization and variations, along with managing incoming replies through a shared inbox. Among its features, Ballast includes mailbox warmup, customizable sending schedules, domain verification, inbox-placement testing, and bounce threshold settings that can pause sending, in addition to detailed campaign analytics. The pricing structure is based on the quantity of emails sent monthly and encompasses unlimited mailbox connections and user accounts, plus access to APIs, webhooks, and MCP tools. Furthermore, teams can utilize AI models for reply classification and message drafting, configure Slack notifications for replies, or automate workflows using n8n. The platform also supports lead imports from a variety of sources, such as Apollo, Clay, Instantly, Smartlead, and Lemlist, via CSV presets, which enhances its adaptability for marketing teams striving to boost their outreach initiatives. In summary, Ballast not only simplifies cold email campaigns but also enriches them with essential analytics and automation capabilities, making it an invaluable tool for marketers.

Media

Media

Integrations Supported

Microsoft 365
Microsoft Outlook

Integrations Supported

Microsoft 365
Microsoft Outlook
ChatGPT
Claude
Cursor
Gemini
Gmail
Google Workspace
MillionVerifier
Model Context Protocol (MCP)
NeverBounce
NoParam
OpenAI
Slack
ZeroBounce
n8n

API Availability

API Availability

Has API

Pricing Information

$59 per month
Free Version

Pricing Information

$19/month
Starter is $19/month for 20,000 emails per month; Growth is $39/month for 50,000; Scale is $89/month for 150,000. Enterprise pricing is custom. Annual billing includes two months free. Plans advertise unlimited mailboxes and seats.

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

24 Hour Support
Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Online Training

Company Facts

Organization Name

mailr.io

Company Location

United States

Company Website

www.mailr.io

Company Facts

Organization Name

Ballast

Date Founded

2026

Company Location

Romania

Company Website

ballast.to

Categories and Features

Cold Email

Not specified

Categories and Features

Cold Email

Not specified

Email Warmup

Not specified

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