What's the meaning group member being bounce?

Question

and how to remedy the member that being bounce

Answer 1

means the member's e-mail is not active and group mails are not being delivered to that mail address...confirm from the member if he/she still uses the mail address

Answer 2

for many reasons, mail cannot be delivered to a mail account, it's being 'bounced' back

Answer 3

Bouncing members are:

If messages sent to a member are consistently returned to Yahoo! Groups with an error, that member is considered "bouncing." Their Yahoo! Groups account is deactivated, and group messages won’t be delivered to the account.

Once an account is considered bouncing, Yahoo! Groups will send a series of test messages to the member. If the test messages are returned as undeliverable, then the account will continue to bounce. However, if a message is delivered and not returned as undeliverable within five days after it was sent, the account will automatically be reactivated. Members may also manually reactivate their accounts by visiting their My Groups page.

Note: If Yahoo! Groups determines that an email address has been bouncing for more than 6 months, we may remove it from our system.

And how tı reactivate bouncing members:

Yahoo! Groups uses an automated system to test and reactivate email accounts that bounce. For that reason, there’s no need for a moderator to take action to unbounce members. It will happen automatically.

Note: There’s no negative effect on a group if it is has bouncing members; it just means these members aren't getting group emails.

However, if you want or need to unbounce a member more quickly (the automated process usually takes between 3-7 days), moderators can immediately make a "Reactivation Request" for any member of their group (see below) and a user can make such a request for their own account at any time.

Automatic Reactivation

Yahoo! Groups periodically sends automated test messages to bouncing members. If a test message isn’t returned to Yahoo! Groups with an error, we assume the message was successfully delivered and automatically reactivate the member's account. This process doesn’t require any action by the moderator or member.

Manual Reactivation

To manually reactivate a member account for a group you moderate:

Click Members from the list on the left side of any page.

Click the Bouncing tab above the list of members.

Find the member you want to manually reactivate.

Click on the View History link under the "Bounce Status" Column.

Click Send Reactivation Request under the Email Account Reactivation section.

The recipient must then follow the instructions in the Reactivation Request email. If the email doesn't bounce after 5 days, you can also go back to the Edit Members page and click the Reactivate Now button to manually unbounce the member.

Note: The automatic unbouncing process can take several days before a user is sent email again.

Unsubscribe Member

To unsubscribe bouncing members:

Click Members from the list on the left side of any page.

Click the Bouncing tab under Members.

Check the boxes in the Remove column next to the members that you would like to remove from the group.

Click Save Changes.