DMARC Report Analyzer
Open a DMARC aggregate (RUA) report as received (.xml, .xml.gz or .zip) and see every sending source, message counts, SPF and DKIM alignment and what the receiver did, parsed in your browser.
September 29, 2026
MTA-STS Checker
Check a domain's MTA-STS setup: the _mta-sts TXT record, the HTTPS policy file, its mode and max_age, whether every MX host is covered, and the TLS-RPT reporting record.
September 29, 2026
BIMI Checker
Check a domain's BIMI record, whether DMARC is at enforcement, whether the logo is a valid SVG Tiny PS file and whether a VMC or CMC certificate is published.
September 29, 2026
SPF Record Generator
Build a valid SPF record from your server IPs and the services that send for you (Google Workspace, Microsoft 365, MailBaby and others) with the right all policy.
September 29, 2026
Email Domain Health Check
One check for a domain's email setup: MX, SPF, DMARC, MTA-STS, TLS-RPT, BIMI, CAA and DNSSEC, with a pass/warn/fail for each.
September 29, 2026
MX Lookup
Find the mail servers for a domain in priority order, with each server's IP address and reverse DNS, and flag MX hosts whose PTR record does not match.
September 29, 2026
SPF Record Checker
Validate a domain's SPF record: follow every include and redirect, count DNS lookups against the limit of 10, find void lookups, multiple records and risky +all or ?all policies.
September 29, 2026
Email Header Analyzer
Paste message headers to see the delivery path hop by hop with delays, SPF/DKIM/DMARC results, spam filter verdicts and From/Return-Path alignment problems.
September 29, 2026
DKIM Checker
Check DKIM public keys published in DNS: test a specific selector or scan 23 common selectors, see the key type and length, and spot revoked or weak keys.
September 29, 2026
DMARC Checker
Look up and explain a domain's DMARC record: policy, subdomain policy, percentage, reporting addresses and alignment, with warnings for p=none and missing reports.
September 29, 2026
DMARC Record Generator
Create a DMARC TXT record with the right policy, reporting address, percentage and alignment settings, plus the cross-domain authorisation record when reports go elsewhere.
September 29, 2026
Warm Up New Mail Server IP Without Spam Problems
A practical warm-up plan for a new cPanel, DirectAdmin or Postfix mail server IP or a new sending domain — authentication first, a volume ramp by day, relay options, automated warm-up tools and the signals that tell you to slow down.
September 29, 2026