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By default, all new mail-enabled security groups require that all senders be authenticated.
This prevents external senders from sending messages to mail-enabled security groups.
For example, you could add a Mail Tip to large groups to warn potential senders that their message will be sent to lots of people.
You can remove a member by selecting a user in the member list and then clicking Remove .
Use this section to specify whether owner approval is required for users to join the group.
To configure a mail-enabled security group to accept messages from all senders, you must modify the message delivery restriction settings for that group.
This example creates a security group with an alias fsadmin and the name File Server Managers.
If you select the Owner approval is required check box, the group owner or owners receive an email requesting approval to join the group.As previously mentioned, only owners can remove members from the group.