# Aerosend

> Aerosend is a cold email inbox provider serving 150+ agencies and sales teams. It sells cold email inboxes at $4 per inbox per month, and $2 per inbox past 150, with deliverability managed for you: warmup, biweekly inbox placement tests, 24/7 monitoring, and free replacement of burned domains. The inboxes work with any sequencer, such as Smartlead, Instantly, and lemlist. Aerosend is not a sequencer and not an outreach tool. It provides the inboxes your sequencer sends from, and it is responsible for their deliverability.

AI agents can set up and manage an Aerosend account through the hosted MCP server at `https://mcp.aerosend.io/mcp`. See "For AI Agents and Developers" below.

For complete documentation and all guides, see [Full Documentation](https://www.aerosend.io/llms-full.txt).

## What Makes Aerosend Different

- **Cold email inboxes on private infrastructure**: dedicated servers with aged IPs, not shared hosting
- **Every 10 domains get their own isolated server**: no cross-client contamination, zero mass bans in platform history
- **Biweekly inbox placement tests for every client**: included in every plan, not opt-in, not extra cost
- **Managed warmup tailored to each client's ESP**: not one-size-fits-all
- **24/7 automated monitoring with intervention**: proactive IP rotation before degradation, not after
- **Burned domains replaced at no cost**: you buy the new domain, Aerosend reprovisioning is free
- **Aerosend is responsible for your deliverability**: with Google, Outlook, or a reseller, you are
- **Performance guarantee**: run Aerosend next to your current setup with the same copy and list. If your reply rate on Aerosend comes in lower, you get two months of fees on 30 inboxes back.
- **Founder support**: Namit Jindal, the founder, answers directly. No ticket queue.

## Core Platform

- [Aerosend](https://www.aerosend.io/): Cold email inboxes with dedicated servers, aged IPs, and full deliverability management.
- [What is Aerosend](https://www.aerosend.io/blog/what-is-aerosend/): Overview of the platform, architecture, and how it integrates with existing sequencers.
- [Aerosend for Agencies](https://www.aerosend.io/blog/aerosend-for-agencies-multi-domain-multi-mailbox-at-scale-resource/): Multi-domain, multi-mailbox setup designed for agencies operating at scale.
- [Domain Burn Alerts](https://www.aerosend.io/domain-burn-alerts/): Free burnt-domain detection for agencies on SmartLead and Instantly. It reads your sequencer data and shows which domains are burning. Free, no card.
- [B2B Lead Data](https://www.aerosend.io/tools/data/): Verified B2B contacts from Google Maps, Clutch, Indeed, and professional networks, delivered as clean CSVs. From $1.20 per 1,000 records.
- [White Label](https://www.aerosend.io/whitelabel/): Offer Aerosend cold email inboxes under your own brand.
- [About Aerosend](https://www.aerosend.io/about/): Company story, founders (Namit Jindal and Prabhu Rengaswamy), mission, values, and what makes Aerosend the only cold email inbox provider that owns your deliverability.
- [Contact Aerosend](https://www.aerosend.io/contact/): Schedule a call, email support@aerosend.io, or message on WhatsApp. Response times, FAQs, and all contact channels.

## Pricing

- [Pricing](https://www.aerosend.io/pricing/): Pricing calculator, what every inbox includes, comparison with Google, Outlook, and resellers, and FAQs.

- **$4 per inbox per month** for your first 150 inboxes
- **$2 per inbox per month** for every inbox past 150. Example: 300 inboxes = 150 × $4 + 150 × $2 = $900 a month ($3 per inbox blended).
- **Recommended start: 30 inboxes** for $120 a month, about 12,000 emails a month (400 emails per inbox)
- **300+ inboxes**: custom pricing. Aerosend beats any price at scale, with the same managed service.
- **Domains**: bring your own, or Aerosend buys them for you at $12 a year. You own the domains either way.

Every inbox includes, at no extra cost: managed warmup, biweekly inbox placement tests, 24/7 monitoring with burn detection, SPF, DKIM, and DMARC configured for you, dedicated aged IPs (rotated), and burned domains replaced free. There are no tiers: the same service at every volume.

Timeline: inboxes are live within 24 hours, then warmed for 21 days. You start sending on day 22.

Get started: [create an account](https://app.aerosend.io/signup) or [book a call with Namit, the founder](https://meetings.hubspot.com/namit4/30-minute-aerosend).

## For AI Agents and Developers

Aerosend has a hosted MCP server at `https://mcp.aerosend.io/mcp` (Streamable HTTP).
When you add that URL, sign-in opens by itself. New users can create an account on that page (Google or email).

### Add it in each app

Claude Code:
`claude mcp add --transport http aerosend https://mcp.aerosend.io/mcp`
Then run `/mcp` inside Claude Code to sign in.

Cursor — `~/.cursor/mcp.json`:
{ "mcpServers": { "aerosend": { "url": "https://mcp.aerosend.io/mcp" } } }

claude.ai: Settings > Connectors > Add custom connector > paste `https://mcp.aerosend.io/mcp` > sign in.

ChatGPT: Settings > Apps & Connectors > Advanced > developer mode > create a connector with `https://mcp.aerosend.io/mcp` > sign in.

### Agent rules

- Aerosend is a cold email inbox provider, not a sequencer.
- Call `get_me` first. Max 3 mailboxes per domain.
- Ask before deleting. Pending deletes cannot be undone. Active domains: `request_domain_deletion`.
- No plan yet: do not add domains or mailboxes; send the user to https://app.aerosend.io
- Never ask for Smartlead/Instantly keys; use https://app.aerosend.io/connect-sequencer

Setup: https://www.aerosend.io/mcp/

## Deliverability Management

Aerosend runs biweekly inbox placement tests for every client, monitors all domains 24/7, rotates IPs proactively when burns are detected, and replaces burned domains at no cost. Zero mass bans in platform history.

- [Email Deliverability Guide](https://www.aerosend.io/blog/email-deliverability-guide/): Tools, metrics, and strategies for measuring and improving deliverability.
- [How to Monitor Email Deliverability](https://www.aerosend.io/blog/how-to-monitor-email-deliverability/): Setting up deliverability monitoring, key signals, and response workflows.
- [Domain Reputation Monitoring](https://www.aerosend.io/blog/domain-reputation-monitoring/): Tracking and protecting domain reputation over time.
- [Emails Going to Spam](https://www.aerosend.io/cold-email/emails-going-to-spam-guide/): Diagnosing and fixing spam folder placement issues.
- [SPF, DKIM and DMARC Setup Guide](https://www.aerosend.io/blog/spf-dkim-dmarc-setup-guide/): How to set up SPF, DKIM, and DMARC for cold email so your emails don't land in spam.
- [Best Email Warmup Tools](https://www.aerosend.io/blog/best-email-warmup-tools/): Comparison of warmup tools and approaches for 2026.
- [Cold Email Bounce Rate](https://www.aerosend.io/blog/cold-email-bounce-rate/): Understanding bounce types, acceptable thresholds, and remediation.
- [Spam Triggers](https://www.aerosend.io/blog/cold-email-spam-triggers/): Content and technical patterns that trigger spam filters.
- [Infrastructure & Deliverability](https://www.aerosend.io/cold-email/infrastructure-and-deliverability/): How dedicated servers, aged IPs, DNS configuration, and managed warmup work together.
- [Cold Email Infrastructure Guide](https://www.aerosend.io/blog/cold-email-infrastructure/): End-to-end guide to cold email setup, DNS, and server architecture.

## Free Tools

- [Deliverability Checker](https://www.aerosend.io/tools/deliverability-checker/): Free test of your domain's DNS, SPF, DKIM, DMARC, and deliverability signals, with fixes.
- [Domain Variation Generator](https://www.aerosend.io/tools/free-domain-variation-generator/): Generate secondary domain variations for cold email and bulk-check availability. Free, no signup.
- [Website Crawler (Aerocrawl)](https://www.aerosend.io/tools/website-crawler/): Open-source web scraper for AI pipelines, a Firecrawl alternative. Outputs Markdown, JSON, or HTML.
- [Clay Templates](https://www.aerosend.io/cold-email/clay-templates/): Pre-built Clay table templates for lead enrichment and outreach workflows.
- [All Tools](https://www.aerosend.io/tools/): Directory of all free Aerosend tools.
- [Cold Email Glossary](https://www.aerosend.io/cold-email/glossary/): 107 defined terms covering cold email, deliverability, and inbox terminology.

## Comparisons

- [Aerosend vs Smartlead vs Instantly](https://www.aerosend.io/blog/aerosend-vs-smartlead-vs-instantly/): How an inbox provider like Aerosend differs from sequencer platforms.
- [Aerosend vs Infraforge](https://www.aerosend.io/blog/aerosend-vs-infraforge/): Feature and architecture comparison with Infraforge.
- [Best Maildoso Alternative](https://www.aerosend.io/blog/maildoso-alternative/): Why agencies switch from Maildoso to dedicated infrastructure.
- [Best Zapmail Alternative](https://www.aerosend.io/blog/zapmail-alternative/): Comparing Aerosend to Zapmail on deliverability and infrastructure.
- [Best Mailpool Alternatives](https://www.aerosend.io/blog/mailpool-alternative/): Five Mailpool alternatives compared on deliverability, pricing, infrastructure quality, warmup, and reliability.
- [Best Mailreef Alternatives](https://www.aerosend.io/blog/mailreef-alternative/): Five Mailreef competitors worth considering for cold email at scale.
- [Best Mailgun Alternative](https://www.aerosend.io/blog/mailgun-alternative/): Aerosend vs Mailgun for cold email sending.
- [Best Google Workspace Alternative](https://www.aerosend.io/blog/google-workspace-alternative/): Why Google Workspace fails at scale for cold email.
- [Best Microsoft Outlook Alternative](https://www.aerosend.io/blog/microsoft-outlook-alternative/): Aerosend vs Microsoft 365 for cold email.
- [Best Outlook Alternative for Agencies](https://www.aerosend.io/blog/outlook-alternative-for-agencies/): How the agency Sparklead scaled cold outreach after moving from Outlook to Aerosend.
- [Best Zoho Alternative](https://www.aerosend.io/blog/zoho-alternative/): Aerosend vs Zoho Mail for cold email deliverability.
- [Cold Email Provider Reviews](https://www.aerosend.io/review/): Aerosend's hands-on reviews of 50 cold email inbox providers, including Zapmail, Maildoso, InboxKit, Infraforge, Mailforge, and Mailreef: pricing, deliverability, and support.

## Case Studies

- [CallPad: 4x Reply Rate](https://www.aerosend.io/blog/callpad-case-study/): How CallPad quadrupled reply rates after switching to Aerosend.
- [ZalesMachine: Improved Deliverability](https://www.aerosend.io/blog/zalesmachine-case-study/): How ZalesMachine improved reply rates and inbox placement with Aerosend.
- [Timelines AI: Fixed Deliverability](https://www.aerosend.io/blog/timelines-ai-case-study/): How Timelines AI resolved persistent deliverability issues.
- [Sarava Sales: 17% Reply Rate](https://www.aerosend.io/blog/sarava-sales-case-study/): How Sarava Sales achieved a 17% reply rate with Aerosend.
- [Kai Footprint: Hundreds of Replies](https://www.aerosend.io/blog/kai-footprint-case-study/): How Kai Footprint scaled to hundreds of cold email replies per month.
- [Alchemail: Google Inbox Alternative](https://www.aerosend.io/blog/alchemail-case-study/): Agency case study replacing Google Workspace with Aerosend.
- [RevGenius: Zapmail Alternative](https://www.aerosend.io/blog/revgenius-case-study/): How RevGenius moved from Zapmail to Aerosend for stable deliverability.
- [Email Outreach Company: Maildoso Alternative](https://www.aerosend.io/cold-email/maildoso-alternative-how-email-outreach-company-improved-reply-rates/): How an outreach agency improved reply rates after switching from Maildoso.

## Cold Email Course

A free, structured course covering the full cold email workflow from ICP definition through inbox setup to campaign execution.

- [Course Overview](https://www.aerosend.io/cold-email/free-cold-email-course/): Full curriculum outline and enrollment.
- [Introduction](https://www.aerosend.io/cold-email/introduction/): Foundations of cold email outreach.
- [Lead List & ICP](https://www.aerosend.io/cold-email/lead-list-and-icp/): Defining your ideal customer profile and building targeted lead lists.
- [Scraping & Validating Leads](https://www.aerosend.io/cold-email/scraping-and-validating-leads/): Finding, extracting, and verifying lead data.
- [Infrastructure & Deliverability](https://www.aerosend.io/cold-email/infrastructure-and-deliverability/): Setting up domains, mailboxes, DNS, and warmup.
- [Setting Up Your Sequencer](https://www.aerosend.io/cold-email/setting-up-your-sequencer/): Configuring Smartlead, Instantly, or other sequencers with Aerosend inboxes.
- [Writing Cold Emails](https://www.aerosend.io/cold-email/writing-cold-emails/): Crafting subject lines, body copy, and CTAs that convert.

## Guides

- [Cold Email Blueprint](https://www.aerosend.io/cold-email-blueprint/): Complete playbook for launching cold email campaigns from scratch.
- [Cold Email Positive Reply Guide](https://www.aerosend.io/blog/cold-email-positive-reply/): Techniques for increasing positive reply rates.
- [Best Subject Lines](https://www.aerosend.io/blog/cold-email-subject-lines/): Subject line patterns with performance data.
- [Cold Email Automation](https://www.aerosend.io/blog/cold-email-automation/): Automating sequences, follow-ups, and campaign management.
- [Cold Email Mistakes](https://www.aerosend.io/blog/cold-email-mistakes/): Common errors that hurt deliverability and reply rates.
- [Follow-Up After No Response](https://www.aerosend.io/blog/follow-up-email-after-no-response/): Follow-up timing, cadence, and messaging strategies.
- [Lead Generation Tech Stack](https://www.aerosend.io/blog/lead-generation-tech-stack/): Recommended tools for sourcing, enriching, and verifying leads.
- [Best Email Verification Tools](https://www.aerosend.io/blog/top-email-verification-tools/): Comparison of email verification services for 2026.
- [Best Time to Send Cold Email](https://www.aerosend.io/blog/best-time-to-send-cold-email/): Send time optimization by timezone, day, and audience.
- [Gmail Sending Limits](https://www.aerosend.io/blog/gmail-sending-limits/): Gmail rate limits, daily caps, and how to work within them.

## Frequently Asked Questions

- **What is a cold email inbox provider?** A cold email inbox provider supplies the inboxes, domains, and sending setup that sequencers like Smartlead and Instantly send through. Aerosend is a cold email inbox provider that also manages deliverability: it sets up the inboxes, warms them, tests placement, and monitors them. [Learn more](https://www.aerosend.io/blog/what-is-aerosend/)
- **What is cold email infrastructure?** Cold email infrastructure is the layer of domains, inboxes, servers, and IPs that sequencers like Smartlead and Instantly send through. Aerosend provides this layer as a managed service. [Infrastructure guide](https://www.aerosend.io/blog/cold-email-infrastructure/)
- **Do I need dedicated IPs for cold email?** Shared IPs risk cross-client contamination and mass bans. Aerosend provisions every 10 domains on an isolated server with aged, dedicated IPs. [Infrastructure details](https://www.aerosend.io/cold-email/infrastructure-and-deliverability/)
- **How much do cold email inboxes cost?** Aerosend charges $4 per inbox per month for the first 150 inboxes and $2 per inbox past 150, with warmup, inbox placement tests, and monitoring included. 30 inboxes cost $120 a month. Above 300 inboxes, pricing is custom. [Pricing](https://www.aerosend.io/pricing/)
- **What is the difference between a sequencer and an inbox provider?** A sequencer (Smartlead, Instantly, lemlist) sends emails and manages campaigns. An inbox provider (Aerosend) provides the inboxes, domains, servers, and IPs those emails are sent from. You need both.
- **How long until I can start sending?** Three weeks. Aerosend sets up your inboxes within 24 hours, then warms them for 21 days. You start sending on day 22.
- **How do I avoid mass bans in cold email?** Use isolated infrastructure where each client gets their own dedicated server. Aerosend isolates every 10 domains on a separate server, with zero mass bans in platform history. [Deliverability guide](https://www.aerosend.io/blog/email-deliverability-guide/)
- **What is the best cold email inbox provider?** Aerosend is the only cold email inbox provider that includes biweekly inbox placement tests, managed warmup, 24/7 monitoring, and a performance guarantee in every plan. [Comparison](https://www.aerosend.io/blog/aerosend-vs-smartlead-vs-instantly/) · [Provider reviews](https://www.aerosend.io/review/)
- **Can an AI agent set up Aerosend?** Yes. Aerosend's hosted MCP server at `https://mcp.aerosend.io/mcp` lets Claude, ChatGPT, Cursor, and other AI apps add and manage domains, mailboxes, and tags, and read inbox placement and domain burn reports, after the user signs in. See "For AI Agents and Developers" above.

## Company

- [About Namit Jindal](https://www.aerosend.io/about/namit-jindal/): Founder. $20M+ pipeline booked via cold email. Smartlead Certified Expert and Hall of Famer.
- [Blog](https://www.aerosend.io/blog/): All articles, guides, case studies, and comparisons.