Free Email Security & SMTP Diagnostic Tools
Professional email security testing tools: SPF generator, DKIM key creator, DMARC record generator, MTA-STS policy builder, TLS-RPT reporter, BIMI SVG converter, and SMTP port 25 connector.
Available Diagnostics & Tools
Email Security & Authentication Audit | iN2 Tools →
Analyze SPF, DKIM, DMARC, BIMI, MTA-STS, and TLSRPT records to ensure sender authentication compliance.
SMTP Port 25 Test & Mail Server Diagnostic | iN2 Tools →
Initiate a raw TCP handshake with the mail transfer agent (MTA) to test connectivity, TLS capability, and open relay status.
DKIM Signature Header Validator | iN2 Tools →
Run cryptographic verification check on a DKIM signature from raw email headers against the active public DNS key.
SPF Record Flattener & Optimizer | iN2 Tools →
Recursively resolve, validate and collapse nested SPF inclusions to prevent exceeding the DNS lookup limit.
DMARC & TLS-RPT Report Analyzer | iN2 Tools →
Parse and analyze aggregate DMARC XML reports and SMTP TLS-RPT JSON connection logs.
Email Header Analyzer & Hop Tracer | iN2 Tools →
Analyze raw email headers to trace SMTP relay hops, calculate transit delays, and audit SPF/DKIM/DMARC authentication results.
BIMI Configuration Validator | iN2 Tools →
Verify DMARC compliance, check domain BIMI DNS records (validating tags like avp=), and validate SVG logos for SVG Tiny 1.2 PS compatibility.
SPF Record Generator & Syntax Builder | iN2 Tools →
Create a Sender Policy Framework (SPF) DNS record to authorize IP addresses and mail servers allowed to send email.
DKIM Key & Record Generator | iN2 Tools →
Generate a DomainKeys Identified Mail (DKIM) cryptographic key pair and the corresponding DNS TXT record value.
DMARC Record Generator & Policy Builder | iN2 Tools →
Create an Domain-based Message Authentication, Reporting, and Conformance (DMARC) record to define email receiving policies.
TLS RPT Record Generator | iN2 Tools →
Create an SMTP TLS Reporting (TLS RPT) DNS record to request aggregate reports about TLS encryption connection status.
MTA-STS Record & Policy Generator | iN2 Tools →
Create standard-compliant MTA Strict Transport Security (MTA-STS) DNS records and policy files to enforce encrypted SMTP mail delivery.
BIMI Record Generator & Selector Tool | iN2 Tools →
Generate standard-compliant BIMI DNS TXT records containing logo URLs, certificate links, and avatar display preferences.
BIMI SVG Tiny 1.2 Converter | iN2 Tools →
Convert PNG, JPEG, or GIF images into vector paths and generate standard-compliant BIMI SVG Tiny 1.2 files.