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Mailfox vs SMTP Debug Tool
SMTP Debug Tool helps debug SMTP connections, not monitor webhook-based delivery failures.
MailfoxNever let a missed email cost you money again!
SMTP Debug ToolTest and debug your SMTP connection. Quickly and for free. Which to pick
Pick Mailfox if you want…
- Instant alerts for bounced transactional emails
- Integrations with Mailjet, Brevo or Resend (on Mailfox's list, not SMTP Debug Tool's)
Pick SMTP Debug Tool if you want…
- 3-in-1 SMTP testing and debugging
- SMTP connection debugging
- A free tool
- Integrations with Amazon SES, Sendinblue or Google SMTP (on SMTP Debug Tool's list, not Mailfox's)
Side by side
- What it is
- Mailfox:Mailfox monitors transactional email delivery via webhooks and sends instant alerts for bounces and failures.
- SMTP Debug Tool:A free web tool to test, proxy, and blackhole SMTP connections with real-time session logs.
- Best for
- Mailfox:Instant alerts for bounced transactional emails
- SMTP Debug Tool:3-in-1 SMTP testing and debugging
- Who it’s for
- Mailfox:Developers and businesses that rely on transactional email notifications.
- SMTP Debug Tool:Developers and engineers who need to debug email sending setups.
- Pricing
- Mailfox:Paid
- SMTP Debug Tool:Free
- Works with
- Mailfox:Mailgun, SendGrid, Mailjet, Brevo, Resend, Postmark
- SMTP Debug Tool:Amazon SES, SendGrid, Mailgun, Sendinblue, Google SMTP, Elastic Email, SMTP2GO, UniOne
Mailfox features
- No-code webhook integration. Connect Mailgun, SendGrid, Mailjet, Brevo, Resend, and Postmark in minutes without API keys.
- Real-time failure notifications. Receive instant alerts when an email bounces, is marked as spam, or fails temporarily.
- Unlimited event tracking. Track any number of email events without caps.
- Multi-provider support. Use a single Mailfox webhook URL with multiple email providers simultaneously.
- Privacy-focused data storage. Only event metadata is stored; email content is never saved.
- Simple setup. One-minute configuration via provider webhook settings.
SMTP Debug Tool features
- SMTP Test. Run a quick SMTP session in the browser and view the full conversation log.
- SMTP Proxy. Log an existing SMTP connection between your app and mail provider for error analysis.
- SMTP Blackhole. Create a safe test session without exposing real credentials, capturing logs only.
- Real-time logs. See live, detailed logs of every SMTP command and response.
- No login required. All core functions are accessible without registration.
- Extended parameters for logged-in users. Add subject, HTML body, and extra headers, and raise hourly limits.
Mailfox vs SMTP Debug Tool FAQ
Is Mailfox or SMTP Debug Tool free?+
Mailfox is paid. SMTP Debug Tool is free.
Do Mailfox and SMTP Debug Tool integrate with the same tools?+
Partly. Both list Mailgun and SendGrid. Mailfox also lists Mailjet, Brevo, Resend and Postmark; SMTP Debug Tool also lists Amazon SES, Sendinblue, Google SMTP, Elastic Email and 2 more.
On DevHunt
Based on each tool's website and DevHunt data. Details may change; check the official sites.