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Tools

Free email tools for finding candidate addresses, checking CSV lists, reading headers and mail archives, and previewing mail merges before sending.

Match
fromnewsletters@example.com
subjectweekly digest
Then do
Skip inboxNewsletters
mailFilters.xml
<apps:property name='shouldArchive'
<apps:property name='label'
Free tool

Build several Gmail filters at once

Build several Gmail filters on one page, review the rules together, and download one file to import them into Gmail.

SPF
pass
DKIM
pass
DMARC
pass
send-workermail.relay
origin
mail.relaymx.inbox
+2s
mx.inboxdelivered
+1s
Free tool

Email header analyzer for delivery delays

Paste raw email headers to reorder the delivery path, find hop delays and sender-domain differences, and inspect recorded authentication results.

re_invoice.emlContract query.msg2026-07-17.emlFW_ site visit.msg
4 filesone searchable list
Dana ReyesRe: Invoice 4471
Lee NakamuraContract query
Priya RamanFW: Site visit Thursday
Free tool

EML and MSG viewer

Read saved .eml and .msg files in your browser. Drop in loose messages, a folder, or a zip, and search across everything you opened.

report.mbox
Reply check
Ava Chen
Re: kickoff call
Replied
Ben Ortiz
Proposal follow-up
No reply
Dana Lee
Intro from the event
—
Free tool

MBOX viewer

Open a Gmail Takeout .mbox archive in your browser. Search by sender, subject, label, or date, find who never replied, and see reply times per contact.

archive.pst
No Outlook
Inbox4,182
Clients2,910
Sent Items3,046
Archive 20191,177
Free tool

PST viewer

Read an Outlook .pst file in your browser, no Outlook license needed. Browse its folders, search every message, and check attachments by name.

Send list
2 removed
ava@acme.com
mia@northrun.counsubscribed
dan@acme.com
lee@brightpath.ioclient
cara@acme.com
3 ready to sendclean-list.csv
Free tool

Email suppression list scrubber

Compare a campaign list with your suppression rules, then export the rows that remain and an audit explaining every removal.

CSV checks
2 flagged
Email
First name
Domain
info@acme.com
missing
acme.com
jane@company.io
Jane
company.io
bob@gmail.com
Bob
gmail.com
Free tool

Cold email CSV checker

Paste a cold email CSV and get an import decision for each flag, from missing names and duplicates to role-based and free-mail addresses, before you send.

from:amy@example.com
has:attachment
after:2026/01/01
-subject:newsletter
Free tool

Gmail search query builder

Build Gmail search operators from plain-English fields for senders, recipients, subjects, dates, attachments, unread mail, and large files, then copy it.

Free tool

AI email response generator

Free AI email response generator: paste the email you received, say what the reply should do, and get a grounded, ready-to-edit draft in a tone that fits.

A
B
C
1
John
Smith
acme.com
2
Jane
Doe
company.io
3
María
García
example.co
Top candidates
john.smith@acme.com34
jane.doe@company.io34
maria.garcia@example.co34
Free tool

Bulk email permutator

Paste prospect rows, confirm name and domain columns, generate ranked email candidates, and export clean CSVs for outreach research.

1jane.doe@example.com
2jdoe@example.com
3janed@example.com
4doe.jane@example.com
Free tool

Free email permutator

Generate likely company email addresses from a first name, optional middle name, last name, and domain. Copy every generated address to your clipboard.

Mail merge preview
1 issue

Template

Hi {{first_name}},

Quick idea for {{company}}.

Hi Sarah, Quick idea for Acme.

Hi , Quick idea for N/A.

Empty value
Free tool

Mail merge preview tool

Paste your template and CSV. Preview the first 20 merged emails instantly and catch broken variables, empty fields, placeholder values, and unused columns.

Email that keeps moving.