We have one alumni announcement ist with 180,000 members.  Thankfully it is only used once a month and we do restrict it to non-prime time with the PRIME= NO header. :-)

At 2:46 PM -0500 12/3/08, John Mangione wrote about List Recipient Quantity Maximum:
>Hello, all.
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>I'm putting together a superlist that will include several sublists,
>each of which may contain sublists and/or hundreds of members.
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>Has anyone come across practical limits to the ultimate number of
>recipients that should be on a list? Furthermore, have you found any
>ways that would improve performance (or, at least not cause the server
>performance to degrade or, worse yet, cause the server to crash)?
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>Thanks in advance for your information.
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>Listserv Admin Newbie...
>
>John Mangione
>
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