Bounces Damage Your Sender Reputation
Every hard bounce tells inbox providers your list is stale, and bounce risk rises the longer a list sits unused.
Email List Cleaner: Clean and Verify Your Old Email Lists
Email lists go bad fast: up to 25% of B2B contacts change every year. Upload your old list and we'll remove invalid, bounced, duplicate and risky emails, so you can re-engage the rest without hurting your sender reputation.
- 100 free credits
- No credit card required
- 99.8% accuracy
Trusted by teams at
Why You Should Clean an Old Email List
Every month a list sits unused, more of its addresses go dead, get recycled into spam traps, or simply stop existing. Keep your bounce rate under 2% and spam complaints under 0.3% to stay in the inbox.
Gmail, Yahoo and Microsoft Penalize Bad Lists
Gmail and Yahoo require bulk senders to keep spam complaints under 0.3%, and Microsoft now has its own rules for high-volume senders to Outlook. Stale lists push you past those limits.
Email Lists Decay Up to 25% a Year
Up to 25%of B2B contacts can change in a single year
Inactivity accelerates decay. As addresses go stale, your deliverability and sender reputation take a hit.
How to Clean Your Email List in 4 Steps
Go from an old, messy list to a safe-to-send list in minutes. No setup, no configuration.
- 99.9% Uptime API Guarantee
- SOC 2 Type II Compliant Processing
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Step 01Upload1. Upload a CSV (or Paste Emails)
Upload a CSV with up to 25,000 emails per batch, or paste addresses straight in for smaller, one-off lists.
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Step 02Clean-up2. We Remove Duplicates and Typos
Duplicate addresses are removed, and malformed addresses with typos or missing parts are caught before verification starts.
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Step 03Verify3. We Verify Every Address
Each email is checked for syntax, domain and MX records, and mailbox status, then tagged Valid, Invalid, Risky, Catch-All or Do Not Mail.
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Step 04Download4. Download a Safe-to-Send List
Get a status-tagged CSV back, ready to filter and send.
What Our Email List Cleaner Removes
Eight types of bad or risky addresses are caught before your next send.
Invalid & Non-Existent Emails
Addresses where the mailbox doesn't exist or the domain can't receive mail.
Hard Bounces
Addresses that would hard-bounce, removed before they push up your bounce rate.
Duplicates
Repeated addresses are removed, so each contact appears on your list only once.
Syntax Errors & Typos
Malformed addresses, such as a missing @, stray spaces or invalid characters.
Disposable Emails
Temporary inboxes from throwaway email services that stop working soon after signup.
Role-Based Emails
Shared inboxes like info@, sales@ or support@, flagged because they rarely belong to one person.
Do-Not-Mail Addresses
Addresses that should never get marketing email, tagged Do Not Mail so they are easy to drop.
Catch-All Emails
Flagged, not removed: these domains accept any address. Run them through our catch-all email verifier to keep the real ones.
What You Get After Cleaning
Every address comes back tagged and sorted into three groups, so you know exactly what to send, what to send with caution, and what to remove. Download the cleaned list as a CSV.
- Safe to SendValid
- Send With CautionRiskyCatch-All
- RemoveInvalidDo Not MailDisposable
How Often Should You Clean Your Email List?
Clean active lists every 3 months, and always before emailing a list that hasn't been used in 90+ days, after a big import, or after an event. Verify new signups in real time with the Email Verification API.
- Every 3 monthsfor lists you mail regularly
- Before re-sendingto any list unused for 90+ days
- After a big importfrom a CRM, vendor or old tool
- After an eventtrade show, webinar or giveaway signups
Clean Lists From the Tools You Already Use
Verify straight from your CRM, or connect the API to clean lists automatically.
HubSpot
Verify contacts inside HubSpot, with no CSV exports.
Salesforce
Verify leads and contacts directly in Salesforce.
Email Verification API
Send lists programmatically for recurring cleanups and get a status back in under 200ms.
Email Verification APIMCP Connector
Run email verification from AI assistants and agents that support MCP.
Email Verification MCPNeed something else? Use the bulk email verifier for large uploads, or check a single email with Instant Email Check.
Secure Email List Cleaning (SOC 2 Type II)
Your list is encrypted in transit and at rest, and never sold or shared. ReachStream Email Verifier is ISO 27001:2022 certified and complies with major data protection standards.
- SOC 2 Type II
- CCPA Compliant
- GDPR Compliant
- ISO 27001:2022
- PIPEDA Compliant
Email List Cleaning Pricing
Start free, pay only for what you verify. 1 credit = 1 email: cleaning 10,000 emails uses 10,000 credits (about $20 on Growth).
Free Trial
$0for 30 days
100 verification credits to start
- All status tags
- CSV upload
- Full API access
Starter
$15/mo
5,000 credits every month
~$0.003 per email
- Everything in Free
- Bulk upload to 25k
- Email support
- Full API access
Growth
$39/mo
20,000 credits every month
~$0.002 per email
- Everything in Starter
- Full API access
- Priority support
Pro
$79/mo
50,000 credits every month
~$0.0016 per email
- Everything in Growth
- Team seats
- Integrations
- Full API access
Enterprise
Custom
Volume pricing for high-scale lists
- Everything in Pro
- SSO & SAML
- Dedicated manager
- Full API access
Frequently Asked Questions
Upload your list to ReachStream Email Verifier as a CSV file, up to 25,000 emails per batch. Each address is checked in minutes and returned with a status tag (Valid, Invalid, Risky, Catch-All, or Do Not Mail), so you know exactly which contacts are still safe to email.
ReachStream Email Verifier delivers up to 99.8% accuracy on deliverable addresses, using syntax checks, domain and MX validation, and mailbox-level probing rather than a single-pass syntax check alone.
Yes. Cleaning protects your reputation going forward by flagging invalid, risky, and catch-all addresses before you send to them. Verification checks deliverability signals without emailing the addresses on your list, so the check itself doesn't affect your sender reputation.
Use the CSV file format, with up to 25,000 email addresses per batch upload.
Yes. Unused credits expire at the end of each billing cycle and don't roll over. Free Trial credits are valid for the 30-day trial period.
1 credit per email. Plans start at $15/month for 5,000 emails (about $0.003 each), and new accounts get 100 free credits.
Email addresses decay over time as people change jobs, abandon inboxes, or get removed by their provider, so a list that was valid a year ago can have a meaningfully higher bounce rate today. Re-verify before you send to catch dead or risky addresses before they damage deliverability.
Every 3 months for active lists, and always before re-sending to a list older than 90 days.
It removes invalid, abandoned and do-not-mail addresses that often turn into spam traps, but no tool can detect every trap.
Cleaning uses verification, plus de-duplication and removal, to give you a ready-to-send list.
Clean Your Old Email List Before You Send
Upload it free. No credit card, no commitment. Know in minutes which addresses are still safe to send.