A powerful email API to make email sending a breeze

Integrating Mailreef into your existing applications incredibly easy with our RESTful API

We built Mailreef for people who send a lot of cold email

Here’s how automatic domain purchasing works


Create A Mailreef Account

Under your Mailreef dashboard, you will have access to the API Key for your account needed to make Create Email requests.


Make A Request

Via our API, you can then programmatically send a request to create a new mailbox under your defined domain. You can create as many mailboxes as you need at no additional cost.


Start Sending

Once the request has been processed by our servers, your new mailbox is ready to start sending! All mailboxes under Mailreef have full SMTP/IMAP credentials, allowing for high compatibility with any other marketing tool you utilize.


Mailreef Takes 30
Seconds To Spin Up A New Domain & Mailbox.

A study across 200k+ sent emails has shown that Mailreef outperforms Google, Microsoft, and Zoho’s deliverability when looking at cold email open rates. All other providers utilize shared IP addresses that directly hurts deliverability. Mailreef provides all users with a dedicated IP address, allowing you to be in full control of your deliverability rates.

Effortlessly Register Domains

Mailreef’s API allows you to quickly spin up new sender domains and mailboxes within seconds, all without the need to touch your dashboard.

Fully Authenticated
Sending Servers

SPF, DKIM, and DMARC records are automatically setup for every domain and mailbox under Mailreef, allowing for fully secure email transmissions

Dedicated IP Address

We provide every customer with their own dedicated IP address, allowing for full control over your sender reputation.


Compare Mailreef To The Alternatives

Mailreef is built specifically for cold emails. Stop trying to use other email providers to scale your cold email, Mailreef handles the scaling for you.

Allows cold email

1 click mailbox creation

Automatically creates SPF, DKIM, andDMARC

Unlimited free inboxes

Daily send limit per inbox


Auto IP address balancers

Dedicated IP addresses

Screening for spammers

Integrates with cold email tools

What customers say about us

"We made the switch to Mailreef after struggling with Google’s deliverability & pricing structure for years and saw a noticeable increase in our CTR."

Charles - Lead Gen Agency

"Mailreef is bloody awesome. For anyone performing cold email, Mailreef is an essential provider if you are looking for scale."

Jesse - Series A Startup

"Mailreef provided us the ability to scale our cold outreach effortlessly without costing us a fortune along the way. Mailreef allowed us to easily ramp up our outreach while lowering our overall costs"

Richard - Agency Owner

Request access to the best cold email sender on the planet

We have the best cold email system in the industry because we screen and approve every customer.