Free email tracking tools: calculators, SPF/DMARC generators, MPP estimator

Computes how much each booked meeting costs at the rep level, given outreach volume, reply rate, and meeting conversion rate. Useful for justifying tool budget and identifying funnel-leak points.

Reverse-engineer the email volume needed to hit a meeting target. Useful for setting weekly send targets that align to monthly meeting quotas.

Estimates total sales cycle in business days based on prospect engagement velocity (reply latency, multi-touch density, decision-stakeholder count).

Computes bounce rate from total sent and bounced counts. Flags whether you're in healthy territory (<2%), watch zone (2-3%), or sender-reputation-damage zone (>5%).

Calculates total monthly send volume from rep count, daily target per rep, and working days. Useful for capacity planning.

Compares yearly-billed vs monthly-billed cost over 12 months for a SaaS tool. Surfaces the discount and annual saving.

Computes CTR (clicks ÷ delivered) and CTOR (clicks ÷ opens). Surfaces which metric to focus on.

Models B2B list decay at typical 22-30% per year, broken down per quarter. Surfaces re-verification timing.

Enter list size and send frequency, see the monthly cost across the major ESPs and a one-to-one sales tool. Surfaces the bulk-vs-sales-mail tradeoff in dollars.

A quick rule-based score (not Google's actual algorithm, nobody has that) that flags the configuration combinations that historically land mail in spam.

Maps your sending pattern into one of five reputation tiers (Cold, Building, Established, Trusted, At-Risk) with the specific actions to move up or stop the decline.

Enter domain age, days since warmup started, and current daily volume. The tool returns the safe cap for today and the ramped cap for the next 7 days.

For AEs running one-to-one outreach, knowing when a prospect is safe to touch again is the whole game. This tool gives the cooldown by outcome.

Backs into the right TAM-source list size from quota, win rate, and meeting-to-opp rate. Stops the 'we need 10,000 accounts' premature-scale impulse.

Gmail clips messages above 102KB. Outlook stops syncing attachments above 25MB. This tool tells you whether you'll trip either limit.

Complaint thresholds are absolute, not relative to history. This tool gives you the per-send and per-month complaint allowance.

Subscribers who haven't opened in N days are deliverability poison. This tool tells you when to suppress.

Builds a DMARC v=DMARC1 record with the policy, percentage, and rua/ruf reporting addresses configured for your domain.

Builds Google Analytics-compatible UTM-tracked URLs for email campaigns. Output is a single URL you paste into your email.

Creates a B2B-appropriate email signature in both HTML and plain-text format. No image-heavy templates, clean text that renders consistently across mail clients.

Builds the unsubscribe link text and mailto fallback for sales-outreach email. Compliant with CAN-SPAM (US) and GDPR-style opt-out conventions.

Takes HTML email body and produces the plain-text alternative version. Properly preserves paragraphs, links (as 'text (url)' notation), and lists.

Builds a professional out-of-office auto-reply suitable for sales-side communication. Includes optional backup contact and urgency-routing.

Generates calendar-booking link CTAs in different formats (Calendly, Cal.com, HubSpot) with proper UTM tracking and one-click prefill.

Generates a mailto: URL with pre-filled subject, body, CC, and BCC, ready to paste into webpages or messages.

Generates plain-text dividers (--- type) for plain-text emails and signatures. Different visual weights.

Produces the `default._bimi` TXT record you publish in DNS so Gmail and Yahoo render your logo next to the sender name in inbox.

Produces the `.well-known/mta-sts.txt` policy file and the `_mta-sts` DNS TXT record so receiving servers enforce TLS when delivering mail to you.

Produces the `_smtp._tls` TXT record. Pair with MTA-STS so you can see what's actually happening at the TLS layer for mail addressed to your domain.

Produces the confirmation email body and subject for double opt-in flows: subscriber clicks the link to verify, you only add them to the list after confirmation.

Produces both headers (List-Unsubscribe with mailto: and https:, plus List-Unsubscribe-Post: List-Unsubscribe=One-Click) that Gmail and Yahoo require for senders above 5,000/day.

Older sibling of the one-click builder. Produces a List-Unsubscribe header (without the POST extension) for legacy compatibility with older mail clients.

The internet's worst-debated regex. This tool gives you the strict spec version and the practical version most production systems use.

Most missed-send-time problems are timezone arithmetic problems. Type your local time, see the recipient's local time across 12 major business zones.

Building an MTA or a programmatic sender? Every outbound message needs a unique Message-ID; this tool gives you a spec-compliant one.

The boundary string in multipart MIME must not appear in any encoded part. This tool generates one that's safe.

Generates a personalized cold-outreach template using the AE pattern: specific trigger, why-now relevance, single ask. No sequence-style bulk patterns.

Follow-ups differ based on the signal. Opened-not-replied calls for a re-state; total silence calls for a fresh angle.

Asking 'what works?' converts worse than offering two specific times. This template produces the latter.

Renewal nudges fail when they're identical regardless of timing. The 60-day, 30-day, and 14-day touches all need different framing.

Breakup emails are useful as the last touch before suppressing. The manipulative versions ('should I close your file?') hurt more than they help.

Long voicemails get auto-deleted. 22 seconds is the magic length. This tool generates a script that fits.

LinkedIn connection notes have 300 chars; this tool stays under and includes a real reason (not 'wanted to connect').

Parses your SPF record and flags common configuration errors: missing v=spf1 prefix, wrong all-policy, too many DNS lookups (10-lookup limit), missing required includes.

Parses your DMARC record and flags syntax issues, missing required directives, and policy-misconfiguration risks.

Bulk-validates email syntax. Doesn't check deliverability (that requires SMTP probes); flags syntactically broken addresses that would bounce immediately.

Validates the DKIM TXT record format: v=DKIM1, k= algorithm, p= public key presence.

Parses raw email headers from a received message. Extracts From, To, Subject, Received hops, Authentication-Results (SPF/DKIM/DMARC), and Message-ID.

Enter your sending IP. The tool returns the PTR record, validates it matches the forward (A) record for the sending hostname, and flags missing or mismatched PTR.

Catch-all domains accept any address; bounce verification looks clean but mail goes to a black hole. This tool flags the pattern.

Disposable addresses are a signup-fraud and free-tier-abuse signal. This tool flags them against a maintained list of known throwaway domains.

Role accounts get higher complaint rates and lower replies. Sending cold to info@ is a deliverability tax. This tool flags them.

Scores a subject line on length, spam-trigger phrases, ALL CAPS, emoji density, urgency words, and other patterns that affect reply rate in 2026 B2B email.

Analyzes the preview text that appears in inbox snippets after the subject line. Length, repetition with subject, hook quality.

Computes Flesch reading-ease score for email body text. Higher = easier to read. B2B email sweet spot: 50-70.

Paste your subject and the first 200 characters of your email body. The tool shows what the inbox preview will look like in each client and flags the common preheader leak.

Paste a subject. The tool shows the unicode codepoints and the per-platform emoji image so you see what your recipient actually sees.

The classification rules are buried in RFC 3463 and provider-specific extensions. This tool tells you in plain English: retry, suppress, or investigate.

RUA reports arrive as gzipped XML and are unreadable without parsing. This tool extracts the senders, IPs, volumes, and pass/fail rates.

Each Received header is one hop. Parsing them in order shows the message's journey from origin MTA to final delivery, useful for delays and spoofing checks.

An opening that could apply to any prospect is a tell. This tool scores how prospect-specific your opening actually is.

Removes duplicate email addresses from a pasted CSV list. Case-insensitive by default. Optional domain-only mode (one email per domain) for ABM list dedup.

Encodes special characters in URLs (spaces, ampersands, equals) and decodes encoded URLs back to readable form.

Bidirectional JSON ↔ CSV converter for email contact lists. Useful when importing/exporting between tools.

Quick case converter for email-specific copy editing. Sentence case for subject lines (recommended), Title Case for headings, lowercase for casual.

Sibling of the Plain Text Converter from batch 1, but designed for the opposite direction: parsing real-world received HTML emails into clean readable text.

Most markdown-to-HTML converters produce CSS that breaks in Outlook desktop. This one produces table-based, inline-styled, Outlook-tested HTML.

The Gmail-specific rule (dots don't matter, plus-tags don't matter) means foo.bar+anything@gmail.com is the same as foobar@gmail.com. This tool normalizes.

Reply-rate benchmarks across major B2B segments. Use as the comparison baseline for your own reply rates.

Two-tier open-rate benchmarks: raw pixel-load rates (what most trackers report) and confidence-scored real-read rates (what's actually happening). Differ by 20-40 percentage points typically.

Recommends the optimal send time for your recipient based on their timezone and category-wide reply-rate research showing Tuesday-Thursday 10am-noon recipient local as the sweet spot.

Recommended 4-week warm-up volume schedule for a new sending domain or IP. Daily targets and weekly checkpoints.

Bounce rate ranges across major B2B segments. Use as the baseline for evaluating list health.

Email client market-share breakdown for 2026. Affects expected MPP-inflated open rate on your list.

Categorized reference of spam trigger words (free, urgent, etc.) and patterns (ALL CAPS, emoji density, $$$) that increase spam scoring.

The single most-confused topic in email auth. This page explains both headers, where SPF checks, where DMARC checks, and why a SPF-passing email can still fail DMARC.

Enter a domain. The tool returns the MX records, the priority of each, the resolving IP for each, and the mail provider behind them (Google Workspace, Microsoft 365, Fastmail, etc.).

Why a perfectly-authenticated email forwarded through a mailing list often fails DMARC at the final hop, and how ARC fixes it.

Adding your domain to Google Postmaster Tools gives you ground-truth visibility into how Gmail sees you. This checklist walks the full setup.

If any of your outbound mail hits @outlook.com / @hotmail.com / @live.com / corporate Microsoft 365 tenants, SNDS is the visibility layer you need.

you+tag@gmail.com goes to the same inbox as you@gmail.com, but the CRM, the analytics tool, and the deduper all think they're different.

Gmail search is powerful when you know the operators. This page is the full reference with practical examples for sales workflows.

Outlook search uses Keyword Query Language. This page gives the working operators and the ones that look like they should work but don't.

Picking the wrong access protocol gives the wrong tradeoffs (sync, storage, offline, multi-device). This page lays them out side-by-side.

Threading is a client-side decision based on Message-ID, In-Reply-To, References, and (Gmail) Subject. This page explains all four.

If you send to @yahoo.com / @ymail.com / @aol.com, CFL is the only way to know who marked your mail as spam.

Apple Mail makes up 50%+ of B2C and 25%+ of B2B opens. Rendering differences from Gmail/Outlook are real and worth knowing.

Gmail strips style blocks; Outlook desktop uses Word rendering. Both behaviors require different mitigations.

Not all blacklists are equal. Being on Spamhaus ZEN is reputation-killing; being on a no-name list usually isn't. This guide explains.

ZEN is the combined zone most mailbox providers query. Each sub-list (SBL, XBL, PBL) gets you blocked for different reasons.

Senders keep asking 'where's Google's FBL?'. The answer is they don't have one in the classic sense, and Postmaster Tools is the substitute.

Email-client configuration UIs still say 'SSL' when they mean 'TLS'. Knowing the difference matters for compliance audits.

Three SMTP ports, two TLS modes, one extremely common misconfiguration. This guide picks the right combo.

Attribution decides whether email looks like a cost center or a growth engine. The model choice matters more than the data.

Most deliverability problems are gradual. A 10-minute weekly review catches them at warning-light stage instead of inbox-blackout stage.