MX Lookup
Shows the mail servers receiving email for a domain and resolves each MX target IP for mail routing checks.
Content hub · 20 tools
Email Security
Tools for email operations, from MX, SPF, DKIM, and DMARC to real message headers used in delivery analysis.
Review email delivery configuration
The Email Security group helps inspect domain authentication for mail flow. It covers MX, SPF lookup count, DKIM selectors, DMARC policy, MTA-STS, TLS-RPT, and Received or Authentication-Results lines in headers.
Use this group when
- Review a domain before putting email into production.
- Analyze why SPF, DKIM, or DMARC does not pass.
- Inspect real headers when messages land in spam or get rejected.
Tool list
SPF Lookup
Extracts SPF records from TXT records to identify which sources may send mail for a domain.
DKIM Lookup
Looks up a DKIM public key by selector to help verify email signing configuration for a domain.
DMARC Lookup
Looks up the DMARC record at _dmarc to review how a domain handles spoofed or unauthenticated mail.
SPF Analyzer
Analyzes SPF mechanisms, counts DNS lookups, and highlights settings that may cause SPF failures.
DMARC Analyzer
Reads DMARC policy, SPF/DKIM alignment, pct, rua/ruf, and key settings for anti-spoofing reviews.
Email DNS Health Check
Reviews MX, SPF, DKIM, DMARC, MTA-STS, and TLS-RPT for a domain in one consolidated table.
MTA-STS / TLS-RPT Checker
Checks MTA-STS and TLS-RPT records to review TLS protection for SMTP delivery.
DKIM Record Analyzer
Parses DKIM TXT records, splits tags, and checks key type, public key length, and related warnings.
DKIM Generator
Generates a DKIM RSA key pair and matching TXT record in memory for email signing setup.
DMARC Record Generator
Generates a DMARC TXT record from policy, reporting URIs, alignment, and pct rollout settings.
SPF Record Generator
Generates an SPF TXT record from sending sources such as MX, A, include, ip4, ip6, and all policy.
Email Header Analyzer
Analyzes raw email headers to show Received paths, SPF/DKIM/DMARC results, and related sending IPs.
SMTP TLS Checker
Checks whether an SMTP server supports STARTTLS, including protocol, cipher, and certificate verification.
Blacklist / RBL Checker
Checks whether an IP address or domain appears on common DNSBL/RBL blacklist zones.
Mail Server Banner Checker
Reads an SMTP banner and EHLO capabilities from a mail server without sending a test message.
Autodiscover / Autoconfig Checker
Checks Autodiscover and Autoconfig records and endpoints for Outlook, Thunderbird, and mail clients.
ARC Header Analyzer
Analyzes ARC headers in email, including ARC-Seal, ARC-Message-Signature, and ARC-Authentication-Results.
Gmail Dot Trick
Generates Gmail dot-address variants for testing forms, sign-up flows, or email handling.
Email Signature Generator
Creates a simple HTML email signature with personal details, contact information, and social links.
Frequently asked questions
What does the Email Security group check?
It checks MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, blacklists, and email headers to support delivery troubleshooting.
