Split Your Email Traffic Into Separate Streams
An Application is a self-contained email stream inside your account. Each one has its own sending domains, its own allowlists, and its own outbound IP routing, which keeps transactional mail and marketing mail from sharing a reputation.
ApplicationsWhere Separate Streams Make Sense
Most accounts start with a single sending setup and outgrow it. These are the situations where splitting traffic into Applications tends to be worth the setup time.
One Application per client, each with its own verified domains, approved sender addresses, and outbound IPs. Client configurations stay independent under a single login and a single invoice.
Support, billing, and product email each run in their own stream. Changing one team's sending domain or credentials has no effect on the others.
Keep transactional email separate from marketing. Complaints from a campaign stay attached to the marketing stream and its IPs, rather than affecting delivery of password resets and receipts.
Each product gets an Application with its own domains and routing policy. Adding a product means adding a stream, not a second account to reconcile.
Run many streams from one account, each pinned to specific outbound IPs. Keys, domains, and reporting stay in one place instead of spread across several logins.
Issue a vendor credentials scoped to a single Application, restricted to their IP range and to the recipient domains you approve. Their access cannot extend past that Application.
Application ControlsEvery Stream Runs
on Its Own Rules
Each Application carries its own settings: what it is permitted to send, how that mail leaves the network, and how its results are reported back to you.
Create an Application for Each Stream
An Application needs a name and, optionally, an internal note describing what it is used for. From there you set its restrictions: which verified domains it may send from, which local parts are permitted in the From address such as noreply, support, or billing, and which recipient domains it is allowed to send to.
Any field left empty stays unrestricted. Credentials can also be limited to specific IPs or CIDR ranges, so a leaked API key is unusable from outside your network.
Route Each Stream, Then Track It Separately
Every Application can be assigned the outbound IPs its mail sends through. A common setup is transactional email on a dedicated, carefully warmed IP with bulk campaigns on a separate set, so the two reputations stay independent.
Leave the selection empty and the Application falls back to your account default: the shared pool if you have no dedicated IPs, or round-robin across all of them if you do.
Delivery, bounce, and complaint data is then reported per Application, so a failing domain or a campaign drawing complaints shows up against that stream instead of being averaged away by healthy traffic elsewhere.
Flexible PricingApplications Included
on Every Plan
Applications are available on every plan, including the free tier. Add streams as you need them and pay for sending volume rather than per seat or per add-on.
Pick a plan based on how many emails you send each month. You can upgrade, downgrade, or cancel anytime. No lock-in, no hidden fees.
Includes 2 domains
FAQQuestions? We've Got Answers
From deliverability and infrastructure to pricing and integrations, here's what developers ask us most before they send their first email.
Maileroo is an email delivery platform designed to help businesses send both transactional and marketing emails reliably and at scale. We provide a simple yet powerful API, SMTP integration, and a user-friendly dashboard that makes it easy to manage your email communication from a single place. With a focus on deliverability, security, and ease of use, Maileroo handles the complexities of email infrastructure so you can focus on your product. From startups to enterprises, Maileroo offers scalable plans and dedicated support to ensure your emails reach the inbox every time.
Maileroo supports both transactional and marketing emails. You can send transactional emails such as password resets, order confirmations, invoices, and notifications, as well as marketing emails to users who have explicitly opted in to receive them. Whether you're sending automated system emails or managing marketing campaigns, Maileroo provides the tools to automate all of your email communication from a single platform. If unsure about the type of email you're sending, you can always contact our support team for guidance.
Maileroo is built with deliverability at its core. We use strict account verification, continuous monitoring, intelligent automation, and proprietary abuse detection to protect our sending reputation and reduce spam. Combined with automatic suppression handling, SPF, DKIM, and DMARC support, and ongoing infrastructure maintenance, these safeguards give legitimate senders the best chance of reaching the inbox.
Maileroo's infrastructure is strategically hosted in Germany, Netherlands, Finland and France, providing exceptional performance, reliability, and security for customers worldwide. Our infrastructure is fully GDPR compliant, ensuring your data is handled in accordance with strict European data protection regulations. With enterprise-grade security and modern data centers, you can trust that your data is safe with us.
Maileroo provides support through live chat and email, with our team based in Australia to provide both general and technical assistance. Our team is available from 9 AM to 9 PM Melbourne time. Whether you need help with setup, configuration, integrations, or troubleshooting, our experienced team is available to help you get connected and running smoothly. We understand that email infrastructure is critical to your business, which is why providing fast, knowledgeable support is a key priority for us. Our team has the technical background to assist with complex setups and ensure you have the support you need when you need it.
All Maileroo plans include a monthly email quota. If you exceed your allocated quota, any additional emails will not be sent until your quota resets or your plan is upgraded. For paying users, we include a 12% buffer on your monthly quota, giving you extra flexibility in case of unexpected spikes in sending volume. In addition to monthly limits, we apply an hourly sending limits to accounts as a security measure to help protect our sending infrastructure and maintain deliverability. These limits can be easily increased through your dashboard by submitting a request, and our team can quickly review and adjust them to ensure your email sending is not impacted.
We accept credit card or debit card including Visa, Mastercard and American Express, along with PayPal and cryptocurrency payments.
Yes, Maileroo is built to support businesses of all sizes, from startups and small teams to agencies and large enterprises. We offer scalable plans starting from a free 3,000 emails per month option through to custom solutions designed for businesses sending millions of emails and beyond. Our infrastructure is built to scale with your growth, providing reliable email delivery, flexible sending capacity, and the tools needed to power email communication for businesses of all sizes.
Yes. Non-profits and open-source projects get 50% off every Maileroo plan. Get in touch with a short note about what you're building and we'll set it up. No lengthy application, no annual commitment.
FeaturesCrafted for a Delightful Email Experience
Everything behind reliable delivery at any volume: sending, verification, routing, and the analytics to see what happened, from first API call to millions a month.
SMTP Relay
Send transactional and bulk emails through reliable SMTP infrastructure built for speed, security, and deliverability.
Email API
Integrate email delivery into your applications using powerful APIs built for flexibility, scalability, and performance.
Streams
Separate transactional and marketing traffic into isolated sending streams to protect reputation and keep critical emails fast.
Inbound Routing
Receive and route incoming emails directly into your applications using flexible automation and processing workflows.
Email Marketing
Create and deliver marketing campaigns designed to increase engagement, reach, and customer retention.
Webhooks
Receive real-time event notifications for deliveries, opens, and clicks for storage and automation workflows.
Analytics
Monitor email performance with detailed insights, reporting tools, and actionable delivery metrics in real time.
Dedicated IPs
Gain greater sending control with dedicated IPs designed for consistency, reputation, scalability, and reliability.
Developer SDKs
Build integrations faster using SDKs, code examples, and resources for modern application development.
