The toggle in question is
SET listname DIGEST
SET listname NODIGEST
The "SET listname MAIL" and "SET listname NOMAIL" commands simply determine
whether or not mail (either a digest, index, or individual postings) is
sent. If a DIGEST mode user sets NOMAIL while on vacation, then comes
back and sets MAIL, he resumes getting the digest, not individual postings.
This has been the behaviour since the release of 1.8b. Here's the quote
from the 1.8b list owner's release notes (which should more or less be
what is in the list owner's and general user's manuals today):
*******************************************************
* Usability: Change in MAIL, DIGEST and INDEX options *
*******************************************************
Originally, the MAIL, DIGEST, INDEX and NOMAIL options corresponded to
the four possible settings of a single option. That is, switching from
DIGEST to NOMAIL would stop the delivery of new digests, as expected, but
would also make LISTSERV forget that the subscription should be in digest
mode. A subsequent switch to MAIL would restore delivery, but in normal
(non-digest) mode. This was confusing to novice users.
In version 1.8b, the MAIL/NOMAIL option has been isolated from
DIGEST/INDEX. The MAIL/NOMAIL option controls whether messages should be
delivered, and the DIGEST/INDEX/NODIGEST/NOINDEX option controls the
format in which messages should be delivered. Thus, switching to NOMAIL
and back to MAIL now preserves the digest/index/normal delivery setting.
To provide as much compatibility with the old syntax as possible, the
four options now operate as follows:
- DIGEST: enable digest delivery mode (which negates INDEX), enable mail
delivery. No change from version 1.8a.
- INDEX: enable index delivery mode (which negates DIGEST), enable mail
delivery. No change from version 1.8a.
- NOMAIL: disable mail delivery. No change from version 1.8a.
- MAIL: restore mail delivery, without altering the digest/index/normal
delivery setting (new behaviour). For compatibility with 1.8a, if mail
delivery was already active, the MAIL option negates INDEX/DIGEST.
Thus, a user going from NOMAIL to MAIL will keep his previous delivery
options, whereas a user going from DIGEST or INDEX to MAIL will in fact
deactivate index/digest mode.
To revert from digest/index subscription mode to normal delivery, you can
use either the MAIL option as before, or the NODIGEST/NOINDEX option. The
NODIGEST and NOINDEX options were actually present in versions 1.7f and
1.8a, as synonyms for the MAIL option. In other words, you can update
your instructions to indicate that the DIGEST/INDEX options are negated
by the NODIGEST/NOINDEX options, even if your server is not yet running
version 1.8b.
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