SMTP SenpaiMailSenpai
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UnitpostWork Reactor Inc.
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Related Products
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About
SMTP Senpai is the SMTP relay by MailSenpai for the emails your apps, websites and tools send: sign-ups, password resets, order confirmations, notifications and contact forms.
Connect it via standard SMTP (port 2525, STARTTLS), a REST API with JSON responses, or a form endpoint for website forms, including static sites.
Emails are signed with DKIM on your own domain: we provide the DNS records and check them for you. Bounced addresses are suppressed automatically, every email stays in a 90-day sending log and you get a weekly report.
We don't suspend your account because a threshold was exceeded: you get a warning and we tell you what to fix.
Servers and data in the EU. Human support in Italian and English, by ticket and email.
14-day trial at €0 (card required, cancel anytime), then from €12.90/month for 10,000 emails on the annual plan.
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About
Unitpost is an end-to-end customer communications platform.
You describe the workflow you want (a welcome series, shipping updates, a win-back campaign, etc.) and Unitpost builds it for you: ready to run across email, text, and WhatsApp.
Today we support transactional + marketing email with a hybrid template system (visual + code), contacts, segments, campaigns and automations. The foundation is built horizontally from day one: one contact model, one event system, one pricing model (shared sending balance), and every action works the same way in the UI, via API, and through our agent (Ask Unit).
We are not building another email tool. We are building the messaging layer that replaces the pile of tools teams currently stitch together and can be prompted for result, not manually built.
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Not Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Platforms Supported
Windows
Not Supported
Mac
Not Supported
Linux
Supported
Cloud
Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
Developers, SaaS and app makers, web agencies and small businesses that need reliable transactional email
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Audience
Startups, Enterprises, Small Businesses, Developers, Marketers, Founders
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Supported
Online
Supported
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API
Offers API
Supported
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API
Offers API
Supported
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
€12.90/month
Prices in euro, VAT excluded. 14-day free trial: 0 EUR today, card required, up to 100 emails a day. Annual plan: 10,000 emails/month at 12.90 EUR/month; 20,000 at 22.90; 50,000 at 35.02; 100,000 at 43.10. 3-month plan: 10,000 emails at 25.80 EUR/month. Extra blocks of 1,000 emails with a spending cap you set. Dedicated IP from 15 EUR/month (included from 150,000 emails a month).
Free Version
Not Supported
Free Trial
Supported
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Pricing
$10/month
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationMailSenpai
Founded: 2016
Italy
www.mailsenpai.com/smtp-senpai/
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Company InformationWork Reactor Inc.
Founded: 2022
United States
www.unitpost.com
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Alternatives |
Alternatives |
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CategoriesSMTP Senpai sends the transactional emails of apps, websites, online stores and business software (sign-ups, password resets, orders, invoices, notifications, contact forms) through standard SMTP on port 2525, a REST API or a form endpoint. DKIM on your own domain, 90-day sending log, automatic suppression of bounces and complaints, servers and data in the EU. |
Categories |
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Transactional Email Features
A/B Testing
Not Supported
Contact Database
Not Supported
Dynamic Content
Not Supported
Email Monitoring
Supported
Mailing List Management
Not Supported
Reporting/Analytics
Supported
Spam Check
Not Supported
Template Management
Not Supported
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Integrations
Claude
Not Supported
Cursor
Not Supported
Django
Supported
Laravel
Supported
Magento
Supported
Model Context Protocol (MCP)
Not Supported
Node.js
Supported
PrestaShop
Supported
Supabase
Supported
WooCommerce
Supported
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Integrations
Claude
Supported
Cursor
Supported
Django
Not Supported
Laravel
Not Supported
Magento
Not Supported
Model Context Protocol (MCP)
Supported
Node.js
Not Supported
PrestaShop
Not Supported
Supabase
Not Supported
WooCommerce
Not Supported
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