To reduce list volume, a few of the mailing lists hosted by DrugSense will not accept messages from subscribers. Other one-way lists simply provide periodic news and updates from the list owner. A digest is a periodic compilation of list messages. In the case of the DrugSense lists, the digests are actually separate mailing lists. Email sent to the list is compiled in the list's digest and sent out to digest subscribers in a single email containing between three to ten list messages.
Digest frequency is a function of list volume.
If the list is busy, one or more digests may be sent out per day. If the list is not busy, the digest may go out every few days so digest subscribers risk being a bit behind list subscribers. If you are on a list and would like to switch to the digest, unsubscribe from the list before subscribing to the digest. Similarly, if you are subscribed to a digest and would like to switch to the list, first unsubscribe from the digest. Some mailing lists are automatically archived on the DrugSense web site but most are not.