Guides for cleaner contact lists
Practical, step-by-step help for Excel, Google Sheets, CSV files and sending to a list that actually works.
How to Remove Duplicate Emails in Excel, Including the Ones It Misses
Use Remove Duplicates, highlighting and a helper column to catch the duplicate emails Excel misses, and keep the best row.
Read the guide →How to Remove Duplicate Emails in Google Sheets
Delete duplicate emails in place or build a self-updating clean list with UNIQUE, COUNTIF and conditional formatting.
Read the guide →How to Find and Fix Typos in Your Email List
Find misspelled domains like gmial.com and .con in minutes, fix them safely, and keep new typos off your list.
Read the guide →How to Merge Two Contact Lists Without Losing Anything
Combine contact lists the safe way: line up columns, match on email, keep the best details and every unsubscribe.
Read the guide →What a Suppression List Is and Why You Keep It Forever
Who belongs on your do-not-send list, why it's permanent, and how to remove those people from every list before sending.
Read the guide →How to Split a Big Email List Into Smaller Batches
Cut a big list into batches for sending limits, imports and test sends, with spreadsheet formulas or a free tool.
Read the guide →How to Prepare a Contacts CSV Before You Import It
A step-by-step checklist to get a contacts CSV import-ready so names, ZIP codes and emails arrive intact.
Read the guide →Role-Based Email Addresses: Should info@ and sales@ Stay on Your List?
When info@, sales@ and support@ addresses belong on your list, when they don't, and how to find them fast.
Read the guide →Catch-All Email Addresses: Why They Can't Be Confirmed and How to Handle Them
Why catch-all domains accept any address, why that makes them impossible to confirm, and how to email those contacts safely.
Read the guide →How Often Should You Clean Your Email List? A Practical Schedule
A realistic cleaning schedule based on how often you send and where your contacts came from, plus the warning signs.
Read the guide →How to Stop Fake and Bot Signups on Your Email List and Forms
Spot bot signups, block them at the form, and clean out the fake addresses already sitting on your list.
Read the guide →List of Personal Email Domains: Gmail, Yahoo, Outlook and More
107 personal and free email domains in one list, with a free CSV download and how to use it in a spreadsheet.
Read the guide →B2B Sales Email Verification: 7 Techniques That Work
Seven practical ways sales teams check business email addresses before outreach, and what each one can and can't tell you.
Read the guide →What Is a Mailing List? A Plain-English Guide
What a mailing list is, the two main kinds, how to start one properly and how to keep it clean.
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