Poor list quality can cause high bounce rates due to bad mailboxes or bad domains. Consider sending a confirmation email or moving to double-opt-in to reduce bad addresses.
What triggers this alert?
Some bounce categories clearly explain the reason for the bounce while other categories will require additional data to provide a more concise explanation for the bounce. Please create a support case and include the following information:
- Date the email was sent.
- The problem ISP.
- VMTA/IP address used in the email.
We will pull the logs and provide that information and provide solutions to reduce or eliminate those bounces.
- Bad configuration
- Email bounced due to a configuration issue on the sending mta.
- Bad connection
- The connection between our mail server and the receiving mail server could not be properly established.
- Bad domain
- A misspelled domain, a domain with no MX records or a domain that does not exist.
- Bad mailbox
- Recipient's mailbox at the receiving mail server no longer exists.
- Content related
- Receiving mail server did not approve of the content of the email.
- Inactive mailbox
- Recipient's mailbox was inactive/disabled at the time the send was attempted.
- Message expired
- Email message expired in queue on the sending mail server prior to being delivered to the receiving mail server.
- No answer from host
- Sending mail server was unable to establish any connection with the receiving mail server.
- Policy related
- Email was refused due to a local policy violation and/or your from domain was not in a list of allowed recipients on the receiving mail server. Also included here are bad mailbox error messages and spam content messages that are incorrectly formatted by the receiving server.
- Protocol errors
- Receiving server suspected that the email(s) contained bad syntax and/or certain authentication protocols were not identified during the transit of the message.
- Quota issues
- Recipient or local level email quotas were exceeded at the time of send.
- Relaying issues
- Email bounced due to the sending email server being identified as an open relay.
- Routing errors
- Email bounced due to firewall and/or router issues on the receiving email server's end.
- Spam related
- Email bounced due to the receiving email server suspecting that the email content contains spam-like characteristics.
- Virus related
- Receiving mail server suspects that the email sent contain malicious code.
- bounce type could not be properly classified into any of the above categories.