When OPERA-L moved to CUNY, I queried the subscribers as to their
preference in the size of the digest.  It turns out that several of the
low-cost or "free" e-mail providers (e.g. Juno) can't handle very large
messages and 500 lines seemed to make everyone happy.  With a limits of 80
messages per day and 2 posts per subscriber, OPERA-L generates between 2 to
5 digests per day.

Bob Kosovsky
Student, PhD Program in Music                   Librarian
Graduate Center                                 Music Division
City University of New York                     The New York Public Library
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------My opinions do not necessarily represent those of my institutions-------