Most SMTP testers only check if your server connects. Then you need separate tools for SPF, DKIM, DMARC, blacklist checks, and spam scoring.
This does all of it in one test.
- SMTP connection on any port (25, 587, 465, 2525)
- SPF, DKIM, DMARC record verification
- MX and PTR record checks
- IP blacklist scan (major RBLs)
- Spam score analysis
- Your password is used once and never stored
Free. No account. No download.
nesdzo.com/smtp-tester
Create branded QR codes in seconds. Choose your colors, add a logo, and track how many times your code gets scanned.
- Standard QR: free, instant, no signup
- Tracked QR: free email verification, get scan count + timeline
- Download as SVG (print) or PNG (digital)
- Center logo support with error correction
Built by Nesdzo. Free to use.
Tired of uploading sensitive files to random "online unzip" services?
Nesdzo Archive Opener processes your file entirely in your browser.
Your data never leaves your device. No upload, no queue, no file size limit beyond your own memory.
- RAR and ZIP support
- Browse contents before extracting
- Download individual files or everything at once
- Works on Mac, Windows, Linux, Chromebook, even mobile Safari
Built by Nesdzo. Free. No account needed.
Free QR Code Generator - Scan TrackingCustom QR codes with scan tracking. No signup required.May 2026
