Deliverability Guide

Why Sales Leads Bounce and How to Fix It

High bounce rates destroy sender reputation and waste campaign budget. Learn the common causes and how to keep your lists clean.

Common Reasons Emails Bounce

Invalid Email Address

~30-40% of bounces

The email address doesn't exist or never existed. Common causes include typos, fake emails on forms, or addresses that were created but never used.

Prevention: Use real-time email verification at the point of capture or purchase only from vendors who verify emails via SMTP.

Job Changes

~20-25% of bounces

The person left the company and their email was deactivated. Average job tenure is 2-3 years, meaning 30%+ of contacts change annually.

Prevention: Use data that's verified within the last 90 days. Re-verify lists quarterly before major campaigns.

Company Domain Changes

~10-15% of bounces

The company was acquired, rebranded, or shut down. The email domain no longer exists or routes to a different system.

Prevention: Cross-reference company data with recent business records. Remove contacts from companies showing signs of closure.

Full Mailboxes

~5-10% of bounces

The mailbox exists but is full and can't accept new messages. Often indicates an abandoned or rarely-checked account.

Prevention: These are 'soft bounces' that may work on retry. If persistent, treat as inactive and remove from active campaigns.

Spam Traps

~1-5% of bounces

Old email addresses recycled as spam traps by ISPs. Sending to them damages your sender reputation severely.

Prevention: Use verified email lists only. Never use purchased lists that haven't been recently verified. Monitor bounce rates closely.

Role-Based Emails

~5-10% of bounces

Emails like info@, sales@, support@ often have strict filtering or go to distribution lists that reject bulk mail.

Prevention: Filter out role-based emails before campaigns. Focus on personal business emails for better deliverability.

The Impact of High Bounce Rates

Bounces don't just reduce campaign reach—they actively damage your ability to send future emails.

Sender reputation damage

Threshold: >5% hard bounce

ISPs may throttle or block your domain

Email platform risk

Threshold: >10% bounce

Account suspension or additional verification required

Campaign effectiveness

Threshold: Any bounces

Reduced reach, wasted budget, skewed analytics

Domain blacklisting

Threshold: Repeated issues

Emails blocked across multiple ISPs

Prevention Checklist

Verify emails before importing to your CRM

Use double opt-in for form submissions

Purchase only from vendors with real-time verification

Re-verify lists every 90 days

Monitor bounce rates after every campaign

Remove hard bounces immediately

Segment by engagement to identify inactive contacts

Use email warm-up for new domains

Need to Clean Your Email List?

Upload your list for verification and remove invalid emails before your next campaign.

Clean Your List Email Verification FAQ