Email List Cleaner

Your email list is as important as your email content. Sending to invalid addresses, spam traps, or role-based accounts like info@ and support@ damages your sender reputation and increases bounce rates — which in turn causes ISPs to throttle or block your messages. An email list cleaner identifies and removes these problematic addresses before you send.

Hard bounces — messages that fail to deliver because the address does not exist — are one of the most damaging signals a sender can accumulate. A single mailing to a list with 5% invalid addresses can cause your sending domain to be flagged. List hygiene should be performed regularly, especially before large campaigns or re-engagement sequences.

ISP Deliverability includes a built-in list hygiene module. Upload your CSV or plain text file, and the tool identifies invalid addresses, flags role-based accounts, detects disposable email domains, and maintains a suppression list so you never accidentally re-add a hard-bounced address.

What our list cleaner detects

• Invalid email format and non-existent domains
• Role-based addresses (info@, admin@, support@, noreply@)
• Disposable / temporary email domain addresses
• Previously hard-bounced addresses via suppression list
• Duplicate addresses across your list