What is the difference between Soft Bouncing and Hard Bouncing?

In yahoo groups whats the difference between soft & hard bouncing? how can it be fixed?

• when yahoo groups sends a reminder email & a email bouncers why is it described as soft & hard? & whats the difference between soft & hard bouncing? how can it be fixed?

• Answer:

  Yahoo! explains it as follows: What’s the difference between a "hard bounce" and "soft bounce"? Hard Bounce We consider your account to be "hard bouncing" if the error message we get back from your email provider says either of the following: your email account doesn’t exist your ISP refuses all email from Yahoo! Groups. In this case, your Yahoo! Groups account will be deactivated and set to "Bouncing." You won’t receive any group email until your account is reactivated. Learn how to reactivate your account here. Soft Bounce If the error message we get back from your email provider doesn't fall under the definition of a hard bounce (see above), then the error is considered a soft bounce. If your account generates an occasional soft bounce error, it will be logged but no other action will be taken by Yahoo! Groups. However, if your email account consistently generates soft bounce errors for several days, then your Yahoo! Groups account will be considered bouncing and your Yahoo! Groups account will be deactivated. In this case, you won’t receive any group email until your account is reactivated.