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  • MAIL BLOCK Spam Detected
    The message has been classified as Spam by the receiver's mail system. These bounces are less serious than the previous ones, but you still need to monitor them for they are not an encouraging sign. Generally, they are issued based on automatic rules. You should contact the receiver to try to understand why your message was considered spam. 
  • MAIL BLOCK – Attachment Detected
    The message has been refused by addressee's mail system because of a non-allowed attachment. It is best not to include attachments in your message and instead include a link to the file, which you can host on your Web site.
     
  • MAIL BLOCK – Relay Denied
    The message had PERMANENT delivery errors. The message has been blocked by the receiver's mail system because it refuses the connection to the sender's server. Generally this happens when the SMTP server cannot be detected or when accounts just can't receive any external mail.

  • AUTO REPLY
    This is an automatic reply, usually due to the receiver's absence (e.g. Out Of Office, Vacation Message). NOTE: these messages do not always end up in the bounce mailbox; they can be sent directly to the sender's address, thus not being included in N:Bounce statistics. 
  • TRANSIENT BOUNCE
    A temporary error: the delivery system found an error in the receiver's system, but it will try again. If the error persists, the system will give a Hard Bounce error. 
  • SUBSCRIBE REQUEST
    Someone requested via e-mail to be included as a subscriber, but wrote to the bounce e-mail address.
     
  • UNSUBSCRIBE REQUEST
    The receiver requested to be removed from any future message, but did not use the Unsubscribe link and wrote instead to the bounce address.
     
  • CHALLENGE RESPONSE
    E-mail Challenge-Response systems were created to contrast the increase of spamming on mail servers. For example, systems like Challenge-Response, EarthLink SpamBlocker, and SpamArrest, Typically you will manually manage this kind of bounces, once per receiver. A Challenge-Response message is an automatic reply from the receiver meant to verify that the sender is a physical person and not just an automatic system. You will normally receive the message as a reply to your sender's address, and will have to click on the link included in the Challenge-Response mail to clear the way for the delivery.

  • TEMPORARY UNSUBSCRIPTIONS FOR REPEATED BOUNCES
    According to the type of bounces and the number of occurrences, the system will temporarily unsubscribe the recipient to avoid reputation's issues. The number of days might change depending on several factors including the number of unsubscriptions occurred in the past for the same reason

  • DEFINITE UNSUBSCRIPTIONS  FOR REPEATED BOUNCES  
    After a number of temporary unsubscriptions (variable and depending on the severity of the bounce) the contact will be unsubscribed definitely