Bounce Handling

When you send an email and it cannot be delivered, the sending server sends back a failure notification called a bounce. FluentCRM can receive these bounce notifications and automatically update the contact's status — so you stop sending to addresses that don't work and protect your sender reputation.

Why Bounce Handling Matters

Without bounce handling, FluentCRM has no way to know that an email failed after it left your server. Continuing to send to bad addresses increases your bounce rate, which can cause email providers to flag your domain as a spam source. Setting up bounce handling keeps your list clean automatically.

How It Works

1. You configure your email sending service (e.g., Amazon SES, Mailgun, SendGrid) to forward bounce notifications to a webhook URL provided by FluentCRM.
2. When a bounce occurs, the sending service calls that URL.
3. FluentCRM receives the notification and marks the contact as Bounced, removing them from future sends.

The webhook URL is found in FluentCRM under Settings → Email Service (SMTP & Bounce Handlers).

Choose Your Provider

Find the guide for the email service you use to send campaigns:

Provider	Guide
Amazon SES	Bounce Handling with Amazon SES
Brevo	Bounce Handling with Brevo
Elastic Email	Bounce Handling with Elastic Email
Mailgun	Bounce Handling with Mailgun
Pepipost	Bounce Handling with Pepipost
Postal Server	Bounce Handling with Postal Server
Postmark	Bounce Handling with Postmark
SendGrid	Bounce Handling with SendGrid
SMTP2GO	Bounce Handling with SMTP2GO
SparkPost	Bounce Handling with SparkPost
toSend	Bounce Handling with toSend

TIP

If your sending service is not listed above but supports webhooks, you can use the Incoming Webhooks feature under Settings → Incoming Webhooks to receive bounce events from any provider that supports HTTP callbacks.