Debug MailDebugMail.io
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HELOBeyond Code
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Related Products
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About
How Debug Mail work
The service provides command-line access to the virtual SMTP-server. The sender and receiver addresses can be anything, since no real mailings are sent.
The technology used by application developers does not matter, the service will work with PHP, Python, Ruby, Node.js, .NET and many other programming languages and frameworks.
Sharing options
Sharing is the main feature of Debug Mail. To see what the service and other mailings will look like, just connect the right users to the project in the service, and they will see the same thing as the developer who is testing the mailing.
What you can do in Debug Mail
- Send emails to non-existent test addresses instead of real ones.
- Set up email distribution lists with colleagues using team access.
- Work together with other developers on the service.
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About
HELO is a desktop application designed to simplify email testing and debugging for web developers by capturing and analyzing outgoing emails generated by applications during development. Instead of sending emails to real recipients, HELO exposes a local SMTP server that intercepts outgoing messages and displays them inside the application, allowing developers to inspect and verify them before deployment. This approach helps prevent common problems such as broken links, missing images, formatting errors, and other issues that often appear in production emails. It provides detailed debug views that show the email in multiple formats, including HTML rendering, plain text, raw source code, and full message headers, giving developers a complete understanding of how the message is structured. Automated validation tools check links within the email to confirm they return valid HTTP responses, reducing the risk of sending emails with invalid or broken URLs.
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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
Supported
Linux
Not Supported
Cloud
Not Supported
On-Premises
Not Supported
iPhone
Not Supported
iPad
Not Supported
Android
Not Supported
Chromebook
Not Supported
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Audience
For developers, QA engineers, and managers looking for a solution for testing and debugging emails.
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Audience
Web developers building applications that send transactional or automated emails and need a local tool to test, debug, and validate those emails before deployment
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Support
Phone Support
Supported
24/7 Live Support
Not Supported
Online
Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Supported
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API
Offers API
Supported
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API
Offers API
Not Supported
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Screenshots and Videos |
Screenshots and Videos |
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Pricing
$2 per user per month
Free plan - $0
Silver plan - 2 weeks trial period, after $2 per user per month Gold plan - $5 per user per month We provide a free Silver plan for OSS projects.
Free Version
Supported
Free Trial
Supported
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Pricing
$49 per month
Free Version
Supported
Free Trial
Not Supported
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Reviews/
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Reviews/
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Pros & Cons from Real UsersPros
Cons
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Supported
In Person
Not Supported
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Company InformationDebugMail.io
Founded: 2021
United States
debugmail.io
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Company InformationBeyond Code
Founded: 2017
Germany
usehelo.com
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Alternatives |
Alternatives |
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Categories |
Categories |
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Email Testing Features
A/B Testing
Not Supported
Accessibility Testing
Not Supported
Deliverability Rates
Not Supported
DMARC Analytics
Not Supported
HTML Validation
Not Supported
Improvement Recommendations
Not Supported
IP Blacklist Checking
Not Supported
Pre-Send Email Testing
Supported
Preview Across Browsers & Devices
Not Supported
Reporting / Analytics
Not Supported
Sender Reputation Scoring
Not Supported
Spam Testing
Not Supported
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Integrations
HTML
Not Supported
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