Howard,

I think people are trying to tell you that the list configuration entry "default-options= subjecthdr" has nothing to do with whether a message is delivered with a subject tag.   It's a default for new subscribers.

If a subscriber has "subjecthdr" set as a subscriber option, their distribution will have a subject tag.  The actual content of the subject tag is determined by the "subject-tag=" list configuration, with the default being the list name.

If you're no longer seeing the subjecthdr, then I suspect

• someone changed the subjecthdr subscriber setting (for all subscribers).  easy to test, just examine a subscription where you see the problem.
• you are looking at the poster's mail.  Look at the distribution for a non-poster subscriber.
• your Listserv postmaster has implemented an exit to suppress the function
• the mail system of the Listserv (or that all affected subscribers share) now has something that alters mail subject lines.

It's time to contact your Listserv Postmaster to see if the problem exists beyond your list.  They may also have access to, or have access to people that have access to facilities that can show the content of individual mail that was in the mail system.

Cheers, Wayne