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.
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.
The server was unable to deliver your message (ex: unknown user, mailbox not found).
The server could not temporarily deliver your message (ex: Message is delayed due to network troubles).
Unsubscribe or Remove request.
Subscribe request from someone wanting to get added to the mailing list.
Automatic email responder (ex: "Out of Office" or "On Vacation").
The recipient has requested an address change.
A temporary DNS error.
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.
Unable to classify the NDR.
Unable to temporarily deliver message (i.e. mailbox full, account disabled, exceeds quota, out of disk space).
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.
The subscriber explicitly marked this message as spam.
The email was manually deactivated.
Registration Not Confirmed:
The subscriber has not clicked on the confirmation link upon registration or import.
Blocked from this ISP due to content or blacklisting.
SMTP API Error:
An error occurred while accepting an email through the SMTP API.
Unable to deliver inbound message to destination inbound hook.
Email rejected due DMARC Policy.
Template Rendering Failed:
An error occurred while attempting to render your template.