BUG #2500: subscribing for digest

The following bug has been logged online:

Bug reference:      2500
Logged by:
Email address:      marcin.mank@gmail.com
PostgreSQL version: 0.0
Operating system:   Unix
Description:        subscribing for digest
Details:

>>>> subscribe-digest pgsql-general
**** The subscribe command did not succeed.
****
**** The command mode "digest" is invalid.  The following command
**** modes, separated by hyphens ('-') or equals signs ('=') are valid:
****   noinform
****   nolog
****   nomessage
****   nowelcome
****   quiet
****   rule
****   set
****   welcome


The same with pgsql-sql

But http://archives.postgresql.org/ says I can subscribe for a digest of the
above lists.
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