SendBridge

Sending to dead addresses is how a mailing list ends up with a damaged sender reputation and mail that lands in spam.

SendBridge is an email validation service that checks addresses before you send, so campaigns reach real inboxes and deliverability holds up.

It is listed with an API category, which suits teams that want to verify addresses from their own code or signup forms.

Pricing runs on credits, with one credit used per email checked.

The free plan gives you 100 credits a month.

That is enough to test SendBridge on a small list but not to clean a real database.

Paid packs start at $9 for 5,000 credits, or $0.0018 per email.

The price per email falls as volume grows: $29 buys 25,000 credits and $79 buys 100,000.

Larger packs go up to 10,000,000 credits, where the rate drops to about $0.0001 per email.

Some packs are one-time purchases, so you pay for what you need instead of a monthly bill.

That makes this email validation tool a fit if you clean lists in occasional bursts.