The vast majority of the emails we send arrive successfully in your customers' inboxes.
But there are a variety of reasons why an email may not get delivered.
When a bounce does happen, you or someone on your team should take one of the following actions:
- Find a better point of contact at the company
- Correct a misspelled email address
- Possibly cancel their subscription if they aren't responsive
Your team can be notified when bounces happen in Churn Buster via Webhooks, Slack alerts, or through any of 750+ apps via our Zapier integration. You can set those up in your Integration Settings.
Bounce Types
When we notify you of a bounce, we'll include the type of bounce it was. The action you should take will vary based on this. i.e. You'd respond to a temporary delivery issue differently from a spam complaint.
Hard Bounce:
The server was unable to deliver your message (ex: unknown user, mailbox not found).
Message Delayed:
The server could not temporarily deliver your message (ex: Message is delayed due to network troubles).
Unsubscribe Request:
Unsubscribe or Remove request.
Subscribe Request:
Subscribe request from someone wanting to get added to the mailing list.
Auto Responder:
Automatic email responder (ex: "Out of Office" or "On Vacation").
Address Change:
The recipient has requested an address change.
DNS Error:
A temporary DNS error.
Spam Notification:
The message was delivered, but was either blocked by the user, or classified as spam, bulk mail, or had rejected content.
Open Relay Test:
The NDR is actually a test email message to see if the mail server is an open relay.
Unknown:
Unable to classify the NDR.
Soft Bounce:
Unable to temporarily deliver message (i.e. mailbox full, account disabled, exceeds quota, out of disk space).
Virus Notification:
The bounce is actually a virus notification warning about a virus/code infected message.
Spam Challenge Verification:
The bounce is a challenge asking for verification you actually sent the email. Typcial challenges are made by Spam Arrest, or MailFrontier Matador.
Invalid Email Address:
The address is not a valid email address.
Spam Complaint:
The subscriber explicitly marked this message as spam.
Manually Deactivated:
The email was manually deactivated.
Registration Not Confirmed:
The subscriber has not clicked on the confirmation link upon registration or import.
ISP Block:
Blocked from this ISP due to content or blacklisting.
SMTP API Error:
An error occurred while accepting an email through the SMTP API.
Processing Failed:
Unable to deliver inbound message to destination inbound hook.
DMARC Policy:
Email rejected due DMARC Policy.
Template Rendering Failed:
An error occurred while attempting to render your template.