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features
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support

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Description

SMTP Senpai, offered by MailSenpai, serves as the SMTP relay for emails generated by your applications, websites, and tools, handling everything from sign-ups and password resets to order confirmations, notifications, and contact forms. You can connect using standard SMTP (port 2525 with STARTTLS), a REST API that provides JSON responses, or a dedicated form endpoint suitable for web forms, even on static sites. All outgoing emails are DKIM-signed using your own domain, for which we supply the necessary DNS records and verify them on your behalf. Automatically, we suppress bounced addresses, maintain a 90-day log of all sent emails, and provide you with a comprehensive weekly report. Rather than suspending your account upon exceeding a certain threshold, we issue a warning and guide you on what needs to be addressed. Our servers and data operations are based in the EU, and we offer support in both Italian and English through tickets and email. Try us out with a 14-day free trial that requires a card for registration (you can cancel anytime), and then continue with plans starting at €12.90 per month for up to 10,000 emails on an annual subscription. This service ensures reliable email delivery while offering flexibility and support for your communication needs.

Description

Sendmux provides AI agents with dedicated inboxes and a streamlined method for sending emails. Each agent is capable of receiving communications, reviewing conversation threads, managing attachments, replying to messages, and reacting to incoming mail through signed webhooks or Server-Sent Events. Teams can utilize various sending methods including Gmail OAuth, Outlook OAuth, SMTP providers, or managed Amazon SES, allowing for flexibility in their email communications. Additionally, Sendmux offers the ability to distribute sending across different providers using features like weighted routing, sender-domain routing, health checks, failover mechanisms, and customizable quotas based on time intervals such as seconds, minutes, hours, or days. For developers, the platform includes Mailbox, Sending, and Management APIs, comprehensive OpenAPI documentation, SDKs, the sendmux CLI, and MCP tools, along with Sendmux Skills. Moreover, the system ensures tenant isolation, provides mailbox-scoped API keys, supports custom domains, and includes logging and metrics, all while maintaining a usage-based pricing model without imposing fees for each seat or mailbox. This comprehensive approach enhances the overall email management experience for teams and developers alike.

API Access

Has API Yes 

API Access

Has API Yes 

Screenshots View All

Screenshots View All

Integrations

n8n Yes 
Claude No 
Django Yes 
FetchSandbox No 
Gmail No 
LangChain No 
Laravel Yes 
Magento Yes 
Microsoft Outlook No 
Model Context Protocol (MCP) No 
Node.js Yes 
PrestaShop Yes 
Python No 
Ruby No 
Slack No 
Supabase Yes 
Vercel AI SDK No 
WooCommerce Yes 
WordPress Yes 
Zapier No 

Integrations

n8n Yes 
Claude Yes 
Django No 
FetchSandbox Yes 
Gmail Yes 
LangChain Yes 
Laravel No 
Magento No 
Microsoft Outlook Yes 
Model Context Protocol (MCP) Yes 
Node.js No 
PrestaShop No 
Python Yes 
Ruby Yes 
Slack Yes 
Supabase No 
Vercel AI SDK Yes 
WooCommerce No 
WordPress No 
Zapier Yes 

Pricing Details

€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 Trial Yes 
Free Version No 

Pricing Details

$0.15 per 1000 emails
Free Trial No 
Free Version Yes 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Deployment

Web-Based Yes 
On-Premises No 
iPhone App No 
iPad App No 
Android App No 
Windows No 
Mac No 
Linux No 
Chromebook No 

Customer Support

Business Hours No 
Live Rep (24/7) No 
Online Support Yes 

Customer Support

Business Hours Yes 
Live Rep (24/7) Yes 
Online Support Yes 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) No 
In Person No 

Types of Training

Training Docs Yes 
Webinars No 
Live Training (Online) Yes 
In Person Yes 

Vendor Details

Company Name

MailSenpai

Founded

2016

Country

Italy

Website

www.mailsenpai.com/smtp-senpai/

Vendor Details

Company Name

Sendmux

Founded

2026

Country

Australia

Website

sendmux.ai

Product Features

Email Deliverability

DMARC Analytics No 
Deliverability Alerts No 
Deliverability Reporting No 
Email Address Verification No 
Email Content Testing No 
Email Previewing No 
IP Blacklist Monitoring No 
Inbox Placement Testing No 
Reputation Reporting No 

Transactional Email

SMTP Senpai facilitates the delivery of transactional emails for applications, websites, e-commerce platforms, and business applications, including sign-up confirmations, password recovery messages, order notifications, invoices, alerts, and contact form submissions. It operates over standard SMTP via port 2525, provides a REST API, or allows submissions through a form endpoint. You can configure DKIM for your domain, access a 90-day sending log, benefit from automatic suppression of bounces and complaints, and ensure that servers and data storage are located within the EU.

A/B Testing No 
Contact Database No 
Dynamic Content No 
Email Monitoring Yes 
Mailing List Management No 
Reporting/Analytics Yes 
Spam Check No 
Template Management No 

Product Features

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