If your campaign fails to reach one of your recipients Moosend will keep on trying deliver it up to 4 times. This is why your Soft bounces statistic usually needs 1 to 2 days to get concrete results.
If the email sent continues to bounce from the recipient’s mail server, then we will characterize the recipient’s email address as a Hard Bounce address and they will automatically be removed from your mailing lists.
When sending out email campaigns it's very important to be able to distinguish a soft and a hard bounce and recognize why each one might occur. It influences your statistics so make sure you know all you can about the different kinds of bounces that happen!