[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – February 1995

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 (FEB95)

Pos Recipients Site --- ---------- ---- 1 752716 UGA (VM/ESA 2.1) 2 456230 UBVM (VM/ESA 2.2) 3 367517 PSUVM (VM/ESA 2.2) 4 243630 SUVM (???) 5 185192 NDSUVM1 (VM/ESA 2.2) 6 181994 BROWNVM (VM/ESA 1.1) 7 162161 UCBCMSA (VM/ESA 2.1) 8 157628 UICBIT (VM/SP 7) 9 146940 UMDD (VM/HPO 5.0) 10 145424 UKCC (VM/ESA 2.2) 11 114417 DEARN (VM/ESA 1.1) 12 106723 LISTSERV.TAMU.EDU (Solaris 2.4) 13 102123 HEARN (VM/ESA 2.2) 14 101720 KSUVM (VM/ESA 2.2) 15 96054 UKACRL (VM/ESA 1.1) 16 92104 UICVM (VM/ESA 2) 17 90332 LISTSERV.AMERICAN.EDU (???) 18 85965 MSU.EDU (VM/XA SP 2.1) 19 69242 MIZZOU1 (VM/ESA 1.0) 20 69120 AEARN (VM/XA SP 2.1)

Top 20 sites by volume generated (FEB95)

Pos Recipients Site --- ---------- ---- 1 377126 UBVM (VM/ESA 2.2) 2 351615 PSUVM (VM/ESA 2.2) 3 284501 SUVM (???) 4 225762 UKCC (VM/ESA 2.2) 5 220162 NDSUVM1 (VM/ESA 2.2) 6 181197 BROWNVM (VM/ESA 1.1) 7 159232 UMDD (VM/HPO 5.0) 8 143008 TAMVM1.TAMU.EDU (VM/HPO 6.0) 9 131281 LISTSERV.AMERICAN.EDU (???) 10 130031 UICVM (VM/ESA 2) 11 113164 MSU.EDU (VM/XA SP 2.1) 12 105548 IUBVM (VM/SP 7) 13 103011 UGA (VM/ESA 2.1) 14 91609 HEARN (VM/ESA 2.2) 15 88559 KENTVM (VM/ESA 2.1) 16 87282 MIZZOU1 (VM/ESA 1.0) 17 85799 UAFSYSB (???) 18 84037 VTVM1 (VM/XA SP 2.1) 19 82250 CUNYVM (VM/ESA 2.2) 20 79727 JHUVM (???)