105 tools/
Auth checkers
11Popular
SPF checker
Validate a record and see who it authorises.
PopularDMARC checker
See whether your policy enforces anything.
PopularDKIM checker
Find signing keys without the selector.
SPF lookup counter
Count DNS lookups against the limit of ten.
DMARC report parser
Read the aggregate XML receivers send you.
BIMI checker
Record check plus SVG Tiny PS validator.
DMARC alignment checker
Why DMARC passed or failed, from headers.
ARC checker
Decode the ARC chain and who sealed it.
SPF IP tester
Which mechanism matches an IP, and the verdict.
DMARC policy simulator
What your DMARC policy does to a given message.
DMARC rua authorization
Are your DMARC reports allowed to leave the domain?
Generators
15SPF generator
Build a record from your sending services.
DMARC generator
Build a valid record tag by tag.
Signature generator
Free, per platform: Gmail, Outlook, M365, cold.
DKIM generator
Generate a keypair, split ready for DNS.
SPF flattener
Collapse includes into IP ranges.
SPF merger
Two SPF records into one valid one.
MTA-STS generator
Policy file, both records, and the host.
BIMI generator
Record, SVG check and DMARC precheck.
UTM builder
Consistent UTM links for every sequence step.
Gmail signature generator
Pastes clean into Gmail, under the limit.
Outlook signature generator
Word-safe HTML, plus .htm and .txt files.
Microsoft 365 signature
One mail flow rule signs for everyone.
Cold email signature
Plain, link-free, one per sending inbox.
TLS-RPT generator
Build a valid _smtp._tls record.
List-Unsubscribe generator
One-click unsubscribe headers that pass.
AI generators
5AI cold email generator
Three first-touch emails, three angles, one ask.
AI subject line generator
Fifteen short subject lines, three styles.
AI follow-up generator
Follow-ups that add something, not “just checking in”.
AI spintax generator
Turn one email into hundreds of natural variants.
AI ICP generator
An ICP written as list-building filters, not adjectives.
Reputation & monitoring
10Popular
Blacklist checker
Check IPs and domains against blocklists.
Header analyzer
Trace hops and read the real verdicts.
Deliverability score
Grade a domain out of 100, fixes ranked.
Gateway checker
Detect filters in front of the mailbox.
Bulk sender checker
Check Gmail and Yahoo bulk sender rules.
MTA-STS checker
Policy record, file and MX coverage.
TLS-RPT checker
Validate _smtp._tls and its reporting address.
Domain monitor
Daily checks on 30 signals, alerts on change.
Reputation risk calculator
Bounce and complaint rates vs the thresholds.
SMTP connection tester
Does the SMTP/IMAP host connect, upgrade to TLS, accept login?
Email content
10Spam word checker
Trigger words, caps, links and length, scored.
Spintax previewer
Validate spintax, count and render variants.
Email size checker
Gmail clipping, links, pixels and ratios.
Inbox preview
Subject and preview text as each inbox cuts them.
Email signature checker
What your signature adds to every send.
Link preview checker
How a link unfurls, and what is missing.
List-Unsubscribe checker
Is your one-click unsubscribe header actually valid?
Readability checker
Grade level, sentence length, you/I ratio, CTA.
CAN-SPAM checker
Does the copy meet CAN-SPAM, GDPR, PECR, CASL?
GDPR cold email checker
Is this cold email legal in the EU and UK?
Find, verify & clean
12Email verifier
Free email verification — is this address real and safe to send to?
Bounce code decoder
Every SMTP and status code, decoded.
Email list cleaner
Dedupe, role, free-mail, disposable, MX.
Email permutator
Every plausible address for a name, ranked.
Email extractor
Every address out of any text, deduped.
List decay calculator
How fast a list dies, and what that costs.
Bulk email permutator
50 names × 50 domains × 20 patterns, to CSV.
Bulk bounce classifier
Which bounces are your list, and which are you.
Email pattern finder
Work out a company's address format from examples.
Catch-all checker
Does this domain accept mail at any address?
Job title normalizer
Bulk-clean titles into seniority and department.
Lead list splitter
Split a list across inboxes, one company per sender.
DNS lookups
9TXT lookup
Read every TXT record on a domain.
CNAME lookup
See where a hostname points.
AAAA lookup
IPv6 addresses for a hostname.
SOA lookup
Zone authority, serial and timers.
SRV lookup
Service records with port and target.
PTR lookup
Reverse DNS for any IP address.
CAA lookup
Which CAs may issue for a domain.
DANE / TLSA lookup
TLSA records on every MX, decoded.
IP / ASN lookup
rDNS, FCrDNS, ASN and network owner.
DNS tools
7Popular
MX / ESP checker
Identify which provider hosts the mail.
DNS propagation checker
Check if your change has gone live yet.
NS checker
Find the DNS provider, catch split DNS.
Workspace / M365 DNS checker
Compare records against Google or M365.
DNSSEC checker
Signed, delegated, validating — or broken.
DNS TTL checker
TTL per record and time to propagate.
DNS diff
Which domain in the fleet differs, and on what.
Domains
11Domain lookup
WHOIS, DNS, hosting, CMS and headers.
Domain age checker
Registration date, exact age and expiry.
Subdomain finder
Every subdomain in public CT logs.
Domain checker
Every delivery record for a whole list.
Domain host checker
Registrar, DNS host and who serves the site.
Tracking domain checker
Verify a custom click domain end to end.
Secondary domain finder
Generate and check sending domains.
Lookalike domain checker
Which spoofs of your domain already exist.
Subdomain takeover checker
Dangling CNAMEs and NS on your domain.
Domain availability checker
Free or taken, straight from the registry.
Domain expiry checker
Which of your domains expire next, from the registry.
Web & security
6SSL checker
Issuer, expiry and every hostname covered.
WordPress theme detector
Theme, plugins and CMS — free, paid or custom.
Redirect checker
Trace a redirect chain to its final URL.
Security headers checker
HSTS, CSP, cookies and the rest, graded.
Robots & sitemap checker
Who is blocked, and is the sitemap alive.
Website cost estimator
Host, registrar, email, tools — and the yearly bill.
Planning & cost
9Inbox cost comparison
Compare Workspace, Microsoft 365 and SMTP.
Capacity calculator
Size a sending fleet against a target.
Warmup calculator
Day-by-day ramp for new inboxes.
Cold email ROI calculator
Sends to meetings, cost per meeting.
Domain & inbox planner
Volume target to domains, inboxes and cost.
Sequence planner
Daily volume as follow-ups stack, vs capacity.
Cost per meeting comparison
Cold email vs SDR vs ads vs agency, per meeting.
Send-time planner
Send hours that land in each prospect's morning.
A/B test calculator
Significance and sample size for email variants.
Services
When the tools tell you something is wrong
The diagnostics above are free and always will be. When the fix is bigger than a DNS record, this is the work I do.
01 · Diagnose
Deliverability rescue
Mail landing in spam, replies gone quiet, or a domain suddenly blocked. I find the actual cause rather than guessing, and fix it.
- Authentication and alignment failures
- Blocklist delistings and reputation repair
- Gateway and filter-level blocks
- A written report on what broke and why
02 · Build
Email & sending infrastructure
Sending domains, inboxes, authentication and warmup, built to survive volume instead of burning down in a month.
- Domain and inbox fleets at any scale
- SPF, DKIM, DMARC and tracking domains
- Google Workspace and Microsoft 365 inboxes
- Handover documentation you actually own
03 · Move
Domain, DNS & migration
Changing registrar, mail provider or host without a day of downtime or a week of mail silently failing.
- Registrar and nameserver moves
- Workspace and Microsoft 365 migrations
- MX, SSL and subdomain cutover
- Staged rollout with rollback at every step
04 · Watch
Monitoring & retainer
Infrastructure drifts. Records get edited, certificates expire, domains get listed. Ongoing eyes on the fleet.
- Scheduled checks across every domain
- Alerts before your clients notice
- Monthly reporting
- Priority response when something breaks
Get in touch
Start with a call
Bring a domain and the symptom. I will tell you what is actually wrong and whether you need me at all — plenty of people leave that call able to fix it themselves.
Thirty minutes, no pitch
We will run the checks together on your actual domains, and you will leave knowing what is broken, what it takes to fix, and what it should cost. If that is a job you can do in-house, I will say so.
Bookingtoukirahmed.com/book
Based inRangpur, Bangladesh — all time zones
RepliesWithin one business day
LicensingWorkspace below list price
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