Email Testing for
Developers
Capture and inspect emails in development without sending to real users. SMTP sandbox with team collaboration, secure encryption, and responsive previews.
An SMTP sandbox is a hosted service that captures outgoing emails during software development, preventing test emails from reaching real inboxes while providing inspection of HTML rendering, headers, and attachments.
Acme Corp
Organization Overview
Total Users
5
Mailboxes
3
Total Emails
156
Created
2 weeks
Mailboxes
View All →Production
89 emails
Staging
42 emails
Development
25 emails
Team Members
Manage →John Doe
Sarah Johnson
Mike Kumar
Used by teams at
What is SendPit?
SendPit is an SMTP sandbox for developers. It captures emails from your development and staging environments, displaying them in a safe, isolated inbox where you can inspect, test, and debug without worrying about accidental sends to real users. Built on the SMTP protocol (IETF RFC 5321), SendPit works with any programming language or framework that supports email delivery.
Over 347 billion emails are sent and received worldwide every day.Statista, 2025 Forecast The global average inbox placement rate is 83.5%, meaning one in six legitimate emails never reaches the inbox.Validity, 2025
Learn more about SendpitSafe Testing
Never accidentally send test emails to real users. All emails are captured securely.
Attachments
Preview and download email attachments. Test file uploads end-to-end.
APIs & Webhooks
Integrate with your CI/CD pipeline. Automate email testing with our REST API.
Retention Control
Configure automatic email cleanup. Keep your mailbox organized.
Why SendPit?
Built by developers, for developers. We understand the challenges of email testing.
Prevent Accidental Sends
Stop worrying about test emails reaching production users. SendPit acts as a safety net, capturing all emails from your development environments. No more embarrassing "oops" moments or confused customers.
Faster Debugging
Inspect HTML, view source code, check headers, and test responsive layouts instantly. No more digging through log files or checking spam folders. Everything you need in one beautiful interface.
Team Collaboration
Invite your entire team to collaborate on email testing. Create organizations, manage mailbox access, and assign roles. Everyone stays in sync with shared visibility into test emails.
Secure by Design
All connections secured with TLS encryption. Regenerate SMTP credentials anytime with one click. Configure retention policies to auto-delete emails. Your data stays private and protected.
What Features Does SendPit Offer?
Everything you need to test, debug, and perfect your emails
Multiple Mailboxes
Production
89 emails
Staging
42 emails
Development
25 emails
Create separate mailboxes for each project or environment to keep your test emails organized.
Team Collaboration
John Doe
Sarah Johnson
Invite team member...
Invite team members to your organization and share mailboxes across projects.
Attachment Support
Attachments (3)
View and download all email attachments. Test file uploads end-to-end.
Regenerate Credentials
Username
mb_x7k9m2p4q8r...
Password
••••••••••••••••
Rotate SMTP credentials instantly for enhanced security.
SSL End-to-End Encryption
Connection Secured
All data transmitted securely with TLS encryption. Your emails are always protected.
Responsive Preview
Check how emails render on mobile, tablet, and desktop resolutions.
REST API
$ curl -H "Authorization: Bearer token"
/api/v1/messages/{id}
{ "data": {
"subject": "Welcome",
"codes": ["493812"],
"links": ["https://..."]
} }
Query mailbox messages, download attachments, and extract data programmatically from your CI/CD pipeline.
OTP & Link Extraction
Automatically extract verification codes, magic links, and password reset URLs from every email.
Spam Score Analysis
SpamAssassin-powered spam score on every email. Paid plans include per-rule breakdown to pinpoint deliverability issues.
How Does SendPit Work?
Get started in less than 5 minutes
Create a Mailbox
Sign up and create your first mailbox. Each mailbox gets unique SMTP credentials instantly.
mb_abc123xyz...
Configure SMTP
Add SendPit SMTP settings to your application. SendPit implements the standard SMTP protocol as defined in IETF RFC 5321, so it works with any language or framework.
MAIL_HOST=smtp.sendpit.com
MAIL_PORT=1025
MAIL_USERNAME=mb_abc...
Inspect & Debug
View emails instantly in SendPit. Check content, test links, download attachments.
SMTP Configuration
MAIL_MAILER=smtp
MAIL_HOST=smtp.sendpit.com
MAIL_PORT=1025
MAIL_USERNAME=mb_abc123xyz
MAIL_PASSWORD=your_password
MAIL_ENCRYPTION=tlsTeam Collaboration
Simple, Transparent Pricing
Start free, upgrade when you need more. No credit card required.
Free
Perfect for side projects
- 1 Mailbox
- 2 Team members
- 200 emails/month
- 7-day retention
- — REST API
- — Webhooks
- — Smart Rules
- — Share links & forwarding
Basic
For small teams
- 3 Mailboxes
- 5 Team members
- 1,000 emails/month
- 14-day retention
- REST API (60 req/min)
- — Webhooks
- — Smart Rules
- — Share links & forwarding
Pro
For growing teams
- 10 Mailboxes
- 15 Team members
- 5,000 emails/month
- 60-day retention
- REST API (120 req/min)
- Webhooks (5/mailbox)
- Smart Rules (100)
- Share links & forwarding
Max
For large organizations
- Unlimited Mailboxes
- Unlimited Team members
- 100,000 emails/month
- 60-day retention
- REST API (300 req/min)
- Webhooks (20/mailbox)
- Smart Rules (500)
- Share links & forwarding
Enterprise
CustomUnlimited everything, custom integrations, SLA guarantee
How Does SendPit Compare?
See how SendPit stacks up against popular email testing tools
| Feature | SendPit | Mailtrap | MailHog | Mailpit |
|---|---|---|---|---|
| Free tier | Yes | Yes | Yes | Yes |
| Cloud-hosted | Yes | Yes | No | No |
| Team collaboration | Yes | Yes | No | No |
| REST API | Yes | Yes | Yes | Yes |
| TLS encryption | Yes | Yes | No | Yes |
| Spam score analysis | Yes | Yes | No | Yes |
| Actively maintained | Yes | Yes | No | Yes |
| No infrastructure needed | Yes | Yes | Self-host | Self-host |
Frequently Asked Questions
Everything you need to know about SendPit
Loved by Developers
See what teams are saying about SendPit
"SendPit's SMTP sandbox eliminated our staging email headaches. The team collaboration features let us debug together in real-time. Essential for any development workflow."
Harsh Shah
Lead Developer at B-Rent
"The responsive preview feature is a game-changer. We can test how emails look on mobile, tablet, and desktop all in one place. Saved us countless hours."
Harman Wilson
QA Engineer at Codebox
"Clean interface, powerful features, and instant credential rotation for security. SendPit is exactly what we needed for our staging environments."
Sarah Jackson
Engineering Manager at CaptainWeb
Security & Privacy
Your data security and privacy are our top priorities. SendPit uses industry-standard encryption and follows best practices to protect your emails and credentials.
Retention Controls
Configure automatic email deletion. Choose from 7, 30, 90 days, or custom retention periods.
Credential Rotation
Regenerate SMTP credentials instantly. Rotate passwords anytime for enhanced security.
PII Handling
We never share or sell your data. SMTP credentials are encrypted at rest using AES-256 encryption. All connections are secured with TLS in transit.
Ready to Test Emails Like a Pro?
Join 1,000+ development teams using SendPit to build better email experiences
Free plan includes 1 mailbox and 200 emails/month • Upgrade anytime