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Why Are My Cold Emails Bouncing? (And How to Fix It)

You spent hours writing the perfect cold email, found the leads, and hit send. But instead of replies, your inbox fills up with "Undelivered Mail Returned to Sender."

A high bounce rate is more than just frustrating—it's dangerous. If your bounce rate goes above 2-5%, email providers (Gmail, Outlook) will flag you as a spammer. Your domain reputation drops, and even your legitimate emails will stop landing in the inbox.

⚡ Stop Bounces Before You Hit Send

Floy validates your email lists before you send. Catch invalid, catch-all, and disposable addresses instantly.

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1. The 3 Types of Email Bounces

To fix the problem, you first need to know what kind of bounce you're dealing with:

2. How to Lower Your Bounce Rate to Near Zero

You cannot fix bounces after you send the email. The damage is already done. You must validate the list before you send.

  1. Bulk Validate. Paste your list into an email validator. The API checks the syntax, pings the MX records, and verifies if the mailbox exists.
  2. Remove the Dead Weight. Delete any email marked as "Invalid" or "Undeliverable."
  3. Handle Catch-Alls with Caution. Domains like Yahoo and corporate servers accept all emails, making them "Catch-Alls." You can send to them, but segment them and monitor bounces closely.

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3. Frequently Asked Questions

What is an acceptable email bounce rate?
For cold outreach, anything under 2% is excellent. Between 2% and 5% is average but needs improvement. Above 5% is a red flag that will damage your domain reputation. If you are seeing 10%+ bounces, stop sending immediately and validate your list.
Why are my emails bouncing even when the address is valid?
If a valid email bounces, it is usually a sender reputation issue. Your domain or IP address has been blacklisted. This happens if you previously sent to too many invalid addresses or got marked as spam. Use a Spam Score Checker to analyze your domain health before your next campaign.
Can I send emails to catch-all domains?
Yes, but with caution. A catch-all domain (like Yahoo or large corporations) accepts every email sent to it, regardless of whether the specific user exists. You won't get a hard bounce right away, but the email might go to a black hole or a catch-all inbox that nobody checks. We recommend segmenting catch-all emails into a separate, low-priority campaign.
How much does an email validator cost?
Most validators charge per email (e.g., $15 for 2,000 emails). Floy offers a flat-rate SaaS model: $50 for an entire year of access, which includes 1,500 validations per month, a bulk email sender, and spam checking tools. It's the most affordable way for freelancers and small agencies to maintain list hygiene.