This is the Mailing List → Other Tab
The Allow Remote Administration option lets list moderators send email messages to the ListServer to manage the list - for instance, to add or remove list members. See the Remote Administration topic for details.
The Allow list members to request a list of members from the ListServer option allows list members to send a Users <listname> command to the ListServer to see a list of members on the list. Usually this will be turned off, but in small, closed, lists it may be useful.
The Slow Message Posting option will make VPOP3 send messages to list members individually rather than as a single message which is BCCd to all list members. This has the advantage that each message has the recipient listed in the To header field, but it has the disadvantage that it takes longer to process the messages, and VPOP3 will have to send out the same message many times, so on a slow Internet connection this may take a while.
The List Moderator indicates a user or distribution list which is the 'moderator' for the list. The moderator may have extra powers over the list, for instance, only the moderator may be allowed to post to the list, or moderators may have to approve messages to the list or moderators may be able to add/remove people from the list. If you select a single user as the moderator, then that user is the moderator. If you select a distribution list, then every member of that list is a moderator.
The Return Address is the location where bounce messages will be sent in response to failed outgoing mailing list messages.
The Spam Threshold indicates whether spam filtering will take place for this list, and, if so, the spam score threshold at which messages will be treated as spam. -1 indicates no spam filtering, 100 is the spam threshold for normal spam filtering.
The Spam Redirection option indicates where detected spam for this list will be sent (if the Spam Threshold is not -1) because only users have spam quarantines in VPOP3 - lists do not have quarantine. If this option is blank then spam to the list is just discarded, otherwise it is sent to the specified email address(es), and if they are VPOP3 users, it will probably be quarantined for those users.
A List Digest can be useful for discussion mailing lists. A list digest will group up messages over a certain period and send them as one message. So, you may have a daily digest for a discussion mailing list which will mean that, each day, a single message will be sent to subscribers of the digest list containing all the messages that were sent on the previous day.
If you select a list in the This list is a digest of ... option, then VPOP3 will create a digest of the selected list's messages and distribute it to members of this list. So, you are configure a mailing list called 'mylist_digest' and you select This list is a digest of: mylist, then VPOP3 will create a message containing all the messages sent to the 'mylist' list and send that message to members of the 'mylist_digest' list. Multiple lists can be digests of a single list - for instance, you may want to have a daily and a weekly digest of a list.
The Archive messages to this list option tells VPOP3 to keep messages distributed by this list for future reference. This is needed if you are going to create digest lists based on this list. So, in the above example, this option would need to be enabled for the 'mylist' list.
The Generate digest messages every X days option tells VPOP3 how often to create the digest messages
The Keep archive messages for X days option tells VPOP3 how long to keep the archived messages for this list. This must be at least as long as the longest 'Generate digest messages every...' option for any lists which are digest lists of this list. So, in the example above, if the mylist_digest list has Generate digest messages every 7 days selected, then the Keep archive messages for X days option for the mylist list must be set to at least 7 days.