Like most email services, we differentiate between "hard" and "soft" bounces. A hard bounce is when an email address is no lomger valid. A soft bounce is for errors such as mailbox quota issues.  Here's how we treat bounces:

• If a bounce message is not unambiguously a bad email address message, we treat it as a soft bounce.
• Unambiguous bad address bounces are treated as hard bounces.
• An address with a hard bounce is marked for deletion immediately.
• An address with a soft bounce is marked as undeliverable.
• If an email is sent to an undeliverable and no bounce received 24 hours later, the address is considered to be good.
• An address that remains undeliverable for more than 14 days AND has more than three soft bounces will be marked for deletion.
• Addresses marked for deletion are processed at midnight, US eastern time.

When an address has been deleted, it may not be used to subscribe to any other FeedBlitz content. If the user is real and the delivery problems are resolved, they may request their account to be re-enabled by writing to FeedBlitz support. 

In addition:

• Auto responders for vacations and delivery confirmations are ignored.
• Change of address autoresponders will be actioned (but please make sure your responder clearly states both old and new addresses).
• We never send read or delivery receipt requests. 
• Unsubscribe requests recieved via ISP feedback loops are immediately honored. 

Finally, it is important to note that if we cannot determine the appropriate email address from the bounce message, or the email address specified is not in our database, it is not possible for us to remove it.  Under these circumstances, you can either:

• Use the unsubscribe link in the original message foro immediate removal, or
• Write to support including the original message as an attachment, so we can determine the correct address to remove.