well there is a workaround you could try.
breakup the mail list into several smaller ones. Then send them out one list at a time.
In member management you can save several searches.
the hard part would be how to break them up in smaller groups.
Advanced search is very limited. But is doable if you take a lot of time the first time around.
Or instead in member management opt for Export list of addresses. , instead of mailing.
then break it up that way and send it with a email program.
