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Online Testing Tools

Free diagnostic tools for network, DNS, email hosting, SSL certificates, and security testing. Instant results, no sign-up required.

Email Credentials Tester

Verify SMTP, IMAP, and POP credentials with support for STARTTLS, SSL/TLS, and unencrypted connections. Test individual protocols or all at once.

Supported Protocols:

IMAP STARTTLS IMAPS POP STARTTLS POPS SMTP STARTTLS SMTPS

No passwords are stored during testing

Test Credentials

Email Authentication Validator

Check domain authentication records to ensure proper email security configuration. Validates SPF, DKIM, and DMARC with detailed error reporting.

Validation Features:

  • SPF
  • DKIM
  • DMARC
  • Detailed error messages and recommendations
Validate Records

Email Send Test

Test your SMTP server by actually sending an email. Verify authentication, connectivity, and delivery capabilities with a formatted test message.

Features:

  • Send actual test email via SMTP
  • SMTP STARTTLS (port 587) and SMTPS (port 465)
  • Professional HTML formatted test message
  • Custom sender and recipient addresses

Passwords never stored or logged

Send Test Email

SSL Validator

Validate SSL/TLS certificates, inspect the chain of trust, check expiration, and verify cipher suites. Supports STARTTLS for SMTP, IMAP, and POP3.

What It Checks:

  • Trust verification against CA store
  • Full certificate chain inspection
  • STARTTLS support (SMTP, IMAP, POP3)
  • Expiration and hostname match
Check Certificate

Multi RBL Check

Check any IP address or hostname against 200+ DNS blacklists simultaneously. Includes FCrDNS verification and real-time streaming results.

Features:

  • 200+ public DNS blacklists
  • FCrDNS verification included
  • Real-time streaming results
  • PDF report export
Check RBLs

Email Decoder (EML/MIME)

Paste a raw email or upload a .eml file to view every decoded header and the HTML/plain body, rendered safely inside a sandboxed iframe.

Features

  • Decodes all headers (RFC 2047)
  • HTML rendered in sandbox iframe
  • Lists attachments and MIME tree
  • Nothing stored on the server
Open EML Decoder

DMARC Report Parser

Upload a DMARC aggregate report (.xml, .xml.gz or .zip) and get a clear interpretation: published policy, pass rate, failing sources and per-record details.

Features

  • Accepts XML, gzip, or zip
  • Pass/fail rate + top sources
  • DKIM / SPF alignment status
  • Nothing stored on the server
Open DMARC Parser

DKIM Key Generator

Generate a fresh RSA keypair for DKIM signing. Pick the domain, selector and key size and get the DNS record plus the private and public PEM ready to deploy.

Features

  • Generates RSA keypair (1024 / 2048 / 4096-bit)
  • DNS TXT record ready to paste
  • Three key sizes for any compatibility
  • Nothing stored on the server
Open DKIM Generator

ActiveSync Test

Validate Exchange ActiveSync (EAS) connectivity against Z-Push / Zimbra servers. Authenticates and lists recent messages, contacts, and calendar items.

Features:

  • Basic auth + Provision handshake
  • Recent inbox messages
  • Contacts directory
  • Upcoming calendar items
Run ActiveSync Test

Why Use InteSys Tools?

Secure & Private

No credentials stored. All tests run in memory and results are never persisted.

Fast & Reliable

Instant results with concurrent testing across multiple protocols and services.

Professional Grade

Built for sysadmins, DevOps engineers, and IT professionals.