ezmlm-0.53 is a qmail-based mailing list manager written by Dan J. Bernstein. It has all the basic functionality of a mailing list manager, such as subscriber address management including automated bounce handling as well as message distribution and archiving.
ezmlm-idx originated as an add-on to ezmlm. It now exists as a complete package on its own, but can still be considered essentially as an extension to ezmlm. It adds multi-message threaded message retrieval from the archive, digests, message and subscription moderation, and a number of remote administration function.
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