If your email cannot be delivered to the intended recipient because of some technical error, the recipient's email server will reject the message and return it to your Finalsite server - this is referred to as a "bounce." The specific nature of the technical error will determine whether this is designated a hard or soft bounce.
A permanent inability to deliver an email is called a "hard" bounce. This frequently occurs because the email address doesn't exist or is invalid in some way; perhaps the recipient's username is incorrect, the specified email address has been deactivated, or the domain name in the address is misspelled.
In contrast, a "soft bounce" may occur due to temporary technical difficulties on the receiving end, where an email is sent to an address that exists but a connection couldn't be made or delivery could not be completed. This often occurs because a user's email inbox is full, or the receiving mail server is having technical difficulties.
In plain language, in a hard bounce the receiving end is saying "We can't deliver this and most likely will never be able to," while a soft bounce is more like "Sorry, we can't deliver this time, please try again."
Quarantining "bad" email addresses
Any email address that gives a "hard bounce" to an eNotify message, for any reason, will be moved to the Bad Email list. Emails on the Bad Email list will be ignored in any future mailing from eNotify.
Bad email addresses are kept in eNotify in a deactivated state. That way, you do not have to worry about accidentally mailing to it again even if you delete the list where it was found originally, or re-upload it into the list, or upload it into a new list. The "bad" designation exists independently of any mailing lists the address may be on, so the list(s) can be deleted without affecting any email addresses that have been identified as bad.
Any bad email address is automatically skipped when eNotify sends messages. Mailing lists do not need to be modified in order to prevent email messages from being sent to addresses that are known to be bad.