When the Digesting and Archiving option is enabled, all posted messages are stored in a Mailbox created in the list owner Account. The LIST module periodically checks that Mailbox and creates list digests and indexes.
A digest message contains a set of the messages posted on the mailing list since the time when the previous digest was composed.
A digest message body contains the digest header, the table of contents (TOC) listing all the messages in the digest, the TOC trailer, the posted messages, and the digest trailer.
A list index message contains the same digest header, TOC, and TOC trailer, but it does not contain the posted messages themselves and it does not contain the digest trailer.
List index messages are created at the same time the list digest messages are created. Digest messages are sent to the digest-mode subscribers, and index messages are sent to the index-mode subscribers.
Generate Every: This setting specifies how often the LIST module should generate digest (and index) messages for this list.
First Digest at: This setting specifies the time of the day when the first digest should be generated.
Note: if the Generate Every setting value is not more than 1 day, every day the first digest is generated at the specified time. If this setting is set to 4:00, the Generate Every setting is set to 1 Day, and the last digest was generated at 23:00 on Monday, the next digest will be generated at 4:00 on Tuesday. If the the Generate Every setting value is set to N days (N>1), the first digest is generated at the specified time N days later: if this setting is set to 4:00, the Generate Every setting is set to 5 Days, and the last digest was generated at 23:00 on Monday, the next digest will be generated at 4:00 on Friday.
If Larger Than: This setting specifies the maximum size of the messages to be included into one digest. If the total size of all messages posted since the last digest was generated exceeds this limit, a new digest (and index) is generated immediately, overriding the Generate Every and First Digest at settings.
if has X messages: This setting specifies the maximum number of messages to be included into one digest. As soon as the specified number of messages is posted, a new digest is generated immediately.
Digest Subject: This text setting specifies the Subject header field for digest and index messages created for this mailing list. If the Prohibit Unmodified Digest Subjects option is selected, the mailing list manager rejects all postings with a reply prefix (Re:, Re>, etc.) followed by an unmodifi