[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – November 1994

There are many possible ways to measure the relative "importance" or "size" of LISTSERV sites: number of lists, number of subscribers, number of messages delivered, etc. In most cases, the number of messages delivered is used to rank mailing list managers, because it is the most accurate measurement of the amount of activity on the server. But, depending on what you are looking for, other variables may be more appropriate. There are currently three LISTSERV "Top 20" lists, ranking the various servers according to:

What do these numbers mean exactly?

The statistics are gathered daily by a monitor at L-Soft which polls all the LISTSERV sites that participate in the "open" LISTSERV network over the worldwide Internet. Corporate servers operating in a "closed" environment are not included.

The statistics are organized in monthly reports. The message volume figures are a flat average of the accumulated traffic for the entire month. Thus, a server that delivers 300,000 messages per month will show a daily average of 10,000 messages. In practice, there is a lot less traffic during the weekend, and even during business days there can be significant fluctuations (~30%). The list statistics (number of lists, number of subscribers, largest lists in the network) are measured as of the last day in the month.

For the current month, the message volume figures are averaged based on the number of days that have elapsed. In practice, the figures are not very meaningful in the first few days, especially if the month starts on a weekend. In that case it is best to refer to the previous month for more accurate figures.

A fourth "Top 20" list is available for the more technically oriented: Number of messages generated by the server. This corresponds to the number of mail messages created by the server while processing postings to its mailing lists. LISTSERV delivers its mail using an intelligent mail delivery function called DISTRIBUTE, which improves mail delivery times and reduces bandwidth usage by spreading the delivery chore over scores of participating servers. Each of these servers processes the recipients for its service area (typically its organization or campus). In most cases, DISTRIBUTE simply alters the manner in which the mail is delivered, and the number of messages forwarded to other sites for optimized delivery is roughly equal to the number of messages received by other sites for the same purpose. In some cases, however, this is not the case, either because the server elected to serve a much wider service area than its own organization, or because it is explicitly forwarding all its deliveries to another machine (for instance, many mainframe-based servers forward their mail to a workstation or PC for delivery).

Top 20 sites by volume delivered (NOV94)

Pos Recipients Site --- ---------- ---- 1 618122 UGA (VM/ESA 2.1) 2 342328 UBVM (VM/ESA 2.2) 3 234420 PSUVM (VM/ESA 2.2) 4 169412 UMDD (VM/HPO 5.0) 5 138872 SUVM (???) 6 135897 UCBCMSA (VM/ESA 2.1) 7 126612 NDSUVM1 (VM/ESA 2.2) 8 120615 BROWNVM (VM/ESA 1.1) 9 115518 TAMVM1.TAMU.EDU (VM/HPO 6.0) 10 115383 ARIZVM1 (VM/XA SP 2.1) 11 103622 HEARN (VM/ESA 2.2) 12 72533 UKACRL (VM/ESA 1.1) 13 64307 AUVM (???) 14 63688 DEARN (VM/ESA 1.1) 15 61565 UICVM (VM/ESA 2) 16 61260 KSUVM (VM/ESA 2.2) 17 58855 UA1VM (???) 18 54864 SEARN (VM/ESA 1.1) 19 51865 UKCC (VM/ESA 2.2) 20 48964 MSU.EDU (VM/XA SP 2.1)

Top 20 sites by volume generated (NOV94)

Pos Recipients Site --- ---------- ---- 1 312131 UBVM (VM/ESA 2.2) 2 240047 PSUVM (VM/ESA 2.2) 3 180710 SUVM (???) 4 167780 NDSUVM1 (VM/ESA 2.2) 5 145829 TAMVM1.TAMU.EDU (VM/HPO 6.0) 6 145272 BROWNVM (VM/ESA 1.1) 7 137834 UICVM (VM/ESA 2) 8 125057 UMDD (VM/HPO 5.0) 9 123107 UKCC (VM/ESA 2.2) 10 100186 AUVM (???) 11 94554 UGA (VM/ESA 2.1) 12 87017 UA1VM (???) 13 80230 HEARN (VM/ESA 2.2) 14 66737 TEMPLEVM (VM/ESA 2.1) 15 65307 IUBVM (VM/SP 7) 16 64136 MSU.EDU (VM/XA SP 2.1) 17 61179 MIZZOU1 (VM/ESA 1.0) 18 60317 ASUACAD (VM/ESA 2.2) 19 59958 VTVM1 (VM/XA SP 2.1) 20 57350 KENTVM (VM/ESA 2.1)