'%20stroke-width='56'%20stroke-linecap='round'%20stroke-linejoin='round'/%3e%3cpath%20d='M452%2092%20L421.6%20196%20L348%20122.4%20Z'%20fill='url(%23gi)'%20stroke='url(%23gi)'%20stroke-width='20'%20stroke-linejoin='round'/%3e%3c/svg%3e)
22 free tools for outbound teams.
Everything we reach for when a campaign breaks: DNS and deliverability checks, list hygiene, copy analysis, and volume maths. Free to use, no account, nothing saved.
Free, no account
No signup, no email wall, no trial timer. Open the tool, get the answer, close the tab.
Nothing is stored
Lists, drafts, and domains are processed in the moment. We keep no database of what you paste in.
Built from real support tickets
Every tool here exists because a mailzy.us customer needed it while fixing a live campaign.
The toolkit
22 outbound tools
Every tool we reach for when a campaign breaks, in one searchable grid. Free to use, no account, nothing saved.
SPF Record Generator
Build a valid SPF record from the providers you actually send with, with a lookup-count warning before you hit the 10 DNS limit.
Open toolDKIM Checker
Paste a domain and selector to confirm the public key is published, the key length is safe, and the record parses.
Open toolDMARC Policy Generator
Generate p=none, quarantine, or reject records with reporting addresses and plain-English notes on what each tag does.
Open toolDomain DNS Inspector
One lookup that returns MX, SPF, DKIM, DMARC, and A records side by side so you can audit a new domain in seconds.
Open toolBlacklist Checker
Check a domain or sending IP against the major DNSBLs and see which listings actually affect inbox placement.
Open toolSpam Trigger Scanner
Scan a draft for spam-trigger phrases, link density, image-to-text ratio, and formatting that filters dislike.
Open toolEmail Syntax & MX Validator
Validate syntax, disposable domains, role addresses, and live MX records for a single address or a pasted batch.
Open toolCatch-All Detector
Find out whether a domain accepts every address so you can decide what to verify, risk, or drop from the list.
Open toolCSV List Cleaner
De-duplicate rows, trim whitespace, fix casing on names and companies, and export a clean CSV entirely in your browser.
Open toolDomain & Company Extractor
Turn a list of emails or URLs into clean root domains and company names, ready for enrichment or exclusion lists.
Open toolSuppression List Builder
Merge unsubscribes, bounces, and existing customers into one deduped suppression file you can upload to any sender.
Open toolDomain Age & WHOIS Lookup
Check registration age and registrar details before you buy a domain or before you trust a prospect's website.
Open toolSubject Line Analyzer
Score length, word count, spam risk, and mobile truncation, then see how the line previews across common inbox clients.
Open toolCold Email Grader
Grade a draft on reading level, sentence length, personalisation, and call to action clarity with fixes for each flag.
Open toolSpintax Generator
Write spintax with live previews of random variants and a duplicate check so every send looks different to filters.
Open toolMerge Tag Preview
Paste a template plus a sample CSV row and see exactly what lands in the inbox, including empty-variable fallbacks.
Open toolEmail Signature Generator
Build a lightweight, text-first HTML signature that renders everywhere and does not tank deliverability with images.
Open toolUnsubscribe Header Generator
Generate compliant List-Unsubscribe and one-click headers plus opt-out footer wording for cold outreach.
Open toolMailbox & Volume Planner
Enter a monthly send target and get the number of domains and mailboxes required at a safe per-mailbox daily limit.
Open toolWarmup Schedule Planner
Generate a day-by-day ramp from first send to full volume, tuned to mailbox age and provider.
Open toolCold Email ROI Calculator
Model replies, meetings, and closed revenue from your volume, then see cost per meeting against your infrastructure spend.
Open toolTime Zone Send Window Planner
Map prospect time zones to your sending schedule so emails land in the morning wherever the list lives.
Open toolTools ship one at a time and go live on this page. Tell us which one you need first.
Free community
Get every free tool - plus the people who use them
Join our free Facebook group for new tool drops, deliverability teardowns, and answers from operators sending cold email every day.