How to Verify Emails in an Excel or CSV File: A Step-by-Step Guide
·2 min read
Most mailing lists end up in a spreadsheet at some point. Maybe you exported contacts from your email tool, collected sign-ups at an event, or inherited a list from a client. Before you send anything, it makes sense to verify those addresses. The good news is you can verify emails in Excel or CSV format without writing code or installing anything.
Step 1: Put your emails in one column
Open your file and make sure your email addresses sit in a single column with a clear header such as "Email". If addresses are spread across several columns, combine them into one.
Step 2: Do a quick manual tidy
Before verifying, a few minutes of cleanup saves time later:
- Remove duplicates. In Excel, use Data → Remove Duplicates on the email column.
- Trim spaces. Stray spaces at the start or end of an address cause false problems. Use the TRIM function or Find and Replace.
- Spot the obvious typos. Scan for things like "gmial.com", "hotmial.com" or a missing "@".
Step 3: Save in the right format
VerifyFlow accepts both CSV and Excel files. If your spreadsheet has several tabs, keep your email list on the first one or save it as its own file. A single file keeps things simple, and it can hold up to 1,000,000 rows.
Step 4: Upload to VerifyFlow
Pay for VerifyFlow and you'll get an access code straight away, then upload your file. VerifyFlow charges a flat £20 per list, so there's no per-address maths and no subscription to cancel.
Step 5: Read the results
Your addresses are sorted into groups:
- Valid: keep these.
- Invalid: these are dead ends. Remove them.
- Catch-all: the domain accepts everything, so the address can't be confirmed. Keep these separate and handle with care.
Step 6: Clean your master file
Remove the invalid addresses from your original spreadsheet, then import the cleaned list back into your email tool. Keep a copy of the original in case you need it.
Common mistakes to avoid
- Verifying once and forgetting. Lists decay, so check again before major campaigns.
- Deleting catch-all addresses without thinking. Many are real people at companies. Test them with a small send first.
- Skipping the tidy. Duplicates and spaces just add noise.
Who this works for
Agencies and freelancers can run client lists through before sending. Online shops can clean a customer export before a sale. Charities and newsletter writers can tidy a supporter list in minutes.
Final thoughts
Spreadsheets make email verification straightforward. Get your addresses into one column, tidy up, upload to VerifyFlow, and remove the dead ends. Your mailing list will be cleaner and your email marketing will reach more real inboxes.