MacOS Support is EOL
Support for the MacOS operating system will be dropped as of the next level-set of LISTSERV 17.0 (as of the date of this document, there have been no level-set releases for 17.0), or as of the release of a later point or full release of LISTSERV, whichever comes first.
Any site still running LISTSERV under MacOS should contact the sales department for information on migrating to another operating system platform, or migrating to an L-Soft ListPlex hosted solution.