I have been monitoring the email delivery for the DG's October issue. I notice the use of two terms, regarding which I did a search. They are "Dropped" and "Bounced". What I found was a discussion on the difference between a soft bounce and hard bounce. Excerpts in italics are from the reference I used: The RFC code and reason for the bounce according to the RFC, hard bounces are depicted by a 5XX code and soft bounces by a 4XX code. Both Bounced and Dropped have 550 codes implying both are hard bounces. Is this correct? A soft bounce means that the email address was valid and the email message reached the recipient’s mail server. However, it bounced back because: The mailbox was full (the user is over their quota) The server was down The message was too large for the recipient’s inbox A hard bounce occurs when the message has been permanently rejected either because: The email address is invalid The email addresses doesn’t exist When you click on your bounced and dropped list you get one list with an explanation and recommended action. Does this amount to just one suppression list? In most cases the action is to remove the e-mail. I gather this is something we should do to maintain e-mail "hygiene" . Is that correct? The result is I am still not sure of the difference in meaning you attach to dropped and bounced. It is now 24 hr since I did the e-mail send-out. There are still 12 items in the queue. How many hours do e-mails with I assume valid addresses remained queued before they are placed in the soft bounced list? Finally, I am looking at the list to get some ideal of the rate at which members open their notices. Here is what I found: after one hour - 10% after five hours - 25% after 12 hours - 30% after 24 hours - 36% As you can see the number opened per hour decreases with hours after being sent. I have already found that after 4 days there is no growth. With three newsletters the rates of opening have been ju45%, au54% se44%.