About Prontuno

Prontuno is transactional email infrastructure for teams that need important account and order emails to arrive.

We give teams an API and SMTP relay for sending receipts, password resets, account alerts, and other messages their customers rely on.

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Approved accounts start with 10,000 free email credits. Every application is reviewed within 24 hours.

What Prontuno does

Prontuno handles the sending layer so your team can focus on the product experience around each message.

Transactional email API: Send individual or batch messages from your application with a REST API. Use it for account verification, password resets, receipts, billing notices, and security alerts.
SMTP relay: Connect applications that already send through SMTP. Keep your existing mail integration and route its messages through Prontuno.
Delivery visibility: Review 30-day delivery logs, receive event webhooks, and manage suppressions for bounces and complaints. Your team has evidence to investigate when a message does not arrive as expected.
Remote MCP server: Connect a compatible AI client to Prontuno over authenticated Streamable HTTP. With user approval, agents can check delivery and manage domains, suppressions, and webhooks, and can send email from one domain when sending is enabled for the connection’s key. Read the MCP setup guide.

What makes Prontuno different

Prontuno’s approach centers on operational control, sender quality, and flexible ways to pay.

Sending IPs we operate: We operate our sending IP address space and monitor its reputation. That gives us direct responsibility for the network decisions behind your mail.
Reviewed, transactional senders: We review every application within 24 hours and accept transactional email only. Newsletters, promotional blasts, purchased lists, and cold outreach are not supported.
API or familiar SMTP: Choose a REST API integration or use standard SMTP. You can fit Prontuno to your application instead of changing how it generates messages.
Prepaid credits or monthly plans: Start with 10,000 free credits after approval, buy prepaid packs from $25, or choose a monthly plan from $99 per team. Pay-as-you-go has no monthly minimum.
Tools to investigate delivery: Use logs and webhooks to follow message events. Authenticate your domain with SPF, DKIM, and DMARC and manage bounced or complained-about addresses through suppressions.

Who uses Prontuno

Prontuno is built for teams that send messages as part of the customer experience.

SaaS and software teams sending account verification, password resets, and security alerts.
Ecommerce and marketplaces sending receipts, order updates, and account notifications.
Developers and product teams who need API or SMTP access, event webhooks, and delivery history.

The team behind Prontuno

Prontuno was founded by Tunbosun Ayinla. Sending a transactional email reliably takes more than an API call: teams also need to authenticate domains, protect sender reputation, handle bounces and complaints, and understand delivery events.

Prontuno takes on that infrastructure work while giving developers straightforward integrations and delivery visibility. We publish product updates and technical guidance on the Prontuno blog.

Read the Prontuno blog

How Prontuno works

A real person reviews your use case, then you connect your domain and application.

01
Request access
Tell us what your application sends and how recipients trigger those messages.
02
Get reviewed
We review applications within 24 hours to confirm transactional use.
03
Authenticate your domain
Add the SPF, DKIM, and DMARC records Prontuno provides for your sending domain.
04
Connect and monitor
Use the API or SMTP relay, then follow delivery with logs, webhooks, and suppressions.

Need help during setup or sending?

Contact our team at support@prontuno.com for account, billing, setup, or product questions.

Prontuno key facts

Company: Prontuno is a product of TUNSLAB LLC.
Type: Transactional email infrastructure and delivery service
Launched: 2026
Founder: Tunbosun Ayinla
Registration jurisdiction: Delaware, United States
Website: prontuno.com
Core offering: Transactional email over REST API or SMTP
Pricing: 10,000 credits after approval; prepaid from $25; monthly plans from $99 per team
Contract terms: Prepaid credits do not require a subscription. See pricing for current monthly plan terms.
Services: Email API, SMTP relay, delivery logs, webhooks, authentication guidance, suppression management
Communication: Email support; applications reviewed within 24 hours
Customers served: Businesses and developers sending transactional email
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Frequently asked questions

What is Prontuno?

Prontuno is transactional email infrastructure for businesses and developers. It sends application email through a REST API or SMTP relay and provides delivery logs, webhooks, and suppression management.

Who is Prontuno for?

Prontuno is for teams that send account, billing, transaction, or security messages. It is not for newsletters, promotional campaigns, cold outreach, or unsolicited bulk email.

Can AI assistants connect to Prontuno?

Yes. Compatible MCP clients can connect to Prontuno’s hosted MCP server after an existing user authorizes access. Connections can manage domains, suppressions, and webhooks for the authorized team, and can send email from one domain when the user enables sending for the connection’s key.

How much does Prontuno cost?

Approved accounts receive 10,000 free credits. Prepaid packs start at $25, and monthly plans start at $99 per team. See the pricing page for current details.

Does Prontuno guarantee inbox placement?

No email provider can guarantee inbox placement because recipient servers make their own filtering decisions. Prontuno operates and monitors sending infrastructure, supports domain authentication, and provides delivery information to help you investigate.

How do I get started?

Request access and describe your transactional email use case. After approval, configure a sending domain, connect through the API or SMTP, and send using your free credits.

Send the emails your customers depend on.

Tell us what you send. We’ll review your application within 24 hours.

Request access