True story...at a job I worked at, migrating a large customer from mailman
to ListServ caused them to "lose" about 1/3rd of the list.  I'd expected
this knowing that MailMan's bounce handling is atrocious, bordering on
non-existant (atleast at the time) - the client did freak out but after
manually investigating a huge number of the automatic deletes, each and
every one was an invalid address, and the old mailman lists were trying to
deliver to them for years.

I've learned that for the most part the ListServ automatic delete will do
the right thing when the settings are appropriate for the list, especially
when combined with PROBE.  It will help your deliverability and improve
your delivery times.

LSoft also had or has an "HPO" license, which I believe enables more
threading amongst other things for very large lists like yours.  They may
or may not have the HPO (High Performance Option) anymore, I haven't kept
pace lately.

HTH

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