SMTP & Email API Test Utility
A free, native tool for testing SMTP relay servers and email API providers. Built for email administrators, developers, and IT professionals who need to quickly verify email delivery configurations.
Windows, macOS & CLI available now
Clean, intuitive interface designed for professionals. Test SMTP servers, preview HTML emails, and diagnose delivery issues.
Main Interface - SMTP Configuration
Send test emails through any SMTP server or choose from 12 integrated API providers. Inspect TLS certificates, diagnose delivery issues, and securely store credentials.
Save SMTP and API credentials securely with AES-256-GCM encryption. Master password protection keeps your credentials safe between sessions.
View full certificate chains including protocol version, cipher suite, issuer details, validity dates, and SHA-256 fingerprints.
24-code error database with actionable troubleshooting hints. Port connectivity testing detects ISP blocking, firewall issues, and DNS failures.
Compose in plain text or HTML with auto-detection. Live preview with rendered and raw source views. 6 preloaded templates included.
One-click sending via SendGrid, Mailgun, Amazon SES, Postmark, Brevo, and 7 more providers with built-in authentication handling.
No analytics, no tracking, no data collection. Your credentials stay local. App Sandbox enabled for maximum security.
One-click API-based sending with all major email service providers. Authentication handled automatically.
Live HTML Email Preview
6 Pre-loaded Email Templates
No subscriptions, no limitations, no strings attached.
Windows 10/11 (x64)
Version 1.0.7.0
macOS 14.0+ (Universal)
Version 1.08
Python (Cross-platform)
Open Source
The and Server List systems are the two primary ways users connect to the eDonkey network . While servers were the original backbone, the Kad (Kademlia) network is a decentralized alternative that doesn't rely on central hubs. 🌐 Current Landscape (April 2026)
If there are already active downloads or connections to traditional servers, the software can use those existing contacts to bridge into the Kad network. Navigate to the Kad interface within the software. Locate the "Bootstrap" panel. Select the option to bootstrap from "known clients."
Paste a trusted nodes.dat URL into the text box. Reliable repository URLs include:
Since there is no central hub, you don't have to worry about a specific server being "fake" or "malicious," which was a common problem with traditional eMule server lists. Important Drawbacks emule kad server list
: Widely considered the gold standard for daily-updated, safe server lists and IP filters.
Within eMule, go to and add a reliable server list URL under “Update Server List from URL.” Then click “Update” to fetch fresh servers.
The Definitive Guide to eMule Kad Server Lists: Secure and Fast P2P File Sharing The and Server List systems are the two
– not because eMule or KAD is bad, but because a “KAD server list” does not exist as implied.
If your eMule interface is frozen or failing to download the file via URL, you can replace the file manually within your operating system. Close eMule completely.
If the Kad icon in your status bar is yellow, it means you have a "LowID" status on Kad. This happens when your computer cannot accept incoming connections. Navigate to the Kad interface within the software
The phrase "eMule Kad server list" serves as a linguistic bridge between two eras of technology. It represents the user’s learned habit of needing a list to connect, clashing with the new technology that makes such a list obsolete. The evolution from static server lists to the dynamic, decentralized Kad network marked the survival of the P2P spirit in the face of legal crackdowns. While the glory days of eMule have faded, replaced by cloud storage and streaming services, the Kademlia protocol lives on, underpinning modern technologies from blockchain to distributed computing. The server list is dead; the network is now infinite.
. You can click "Download" or copy the link into eMule to initialize the connection. From eD2k: If you are already connected to a server, simply click "Bootstrap from known clients"
tab, right-click any existing server, and select "Remove All" to clear outdated or fake entries. Automatic Update
If you cannot connect to the ED2K network, you can download a fresh list of active Kad nodes directly from a URL. Navigate to the tab in eMule.
Verify SMTP servers, test API providers, inspect TLS certificates, and diagnose delivery issues. No cost, no limits.