[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – June 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 (JUN95)

Pos Recipients Site --- ---------- ---- 1 538358 UGA (VM/ESA 2.1) 2 376505 UBVM (VM/ESA 2.2) 3 307943 PSUVM (VM/ESA 2.2) 4 203027 UKCC (VM/ESA 2.2) 5 193153 NDSUVM1 (VM/ESA 2.2) 6 186295 LISTSERV.TAMU.EDU (Solaris 2.4) 7 160236 LISTSERV.BROWN.EDU (Ultrix 4.2) 8 151142 DEARN (VM/ESA 1.1) 9 132021 LISTSERV.SYR.EDU (Solaris 2.4) 10 116591 AMERICAN.EDU (AIX 3.2.4) 11 96877 CUNYVM (VM/ESA 2.2) 12 96641 HEARN (VM/ESA 2.2) 13 94570 SJUVM (VM/SP 7) 14 91074 MSU.EDU (VM/XA SP 2.1) 15 89997 UMDD (VM/HPO 5.0) 16 87850 SEGATE (OpenVMS V6.1) 17 84571 UKACRL (VM/ESA 1.1) 18 83476 UCBCMSA (VM/ESA 2.1) 19 77266 LISTSERV.VT.EDU (AIX 3.2.5) 20 76632 UIUCVMD (VM/XA SP 2.1)

Top 20 sites by volume generated (JUN95)

Pos Recipients Site --- ---------- ---- 1 313023 PSUVM (VM/ESA 2.2) 2 286126 UBVM (VM/ESA 2.2) 3 203841 UKCC (VM/ESA 2.2) 4 199949 NDSUVM1 (VM/ESA 2.2) 5 190584 BROWNVM (VM/ESA 1.1) 6 150758 TAMVM1.TAMU.EDU (VM/HPO 6.0) 7 132878 LISTSERV.SYR.EDU (Solaris 2.4) 8 132204 AMERICAN.EDU (AIX 3.2.4) 9 117976 UGA (VM/ESA 2.1) 10 108491 MSU.EDU (VM/XA SP 2.1) 11 106078 UMDD (VM/HPO 5.0) 12 105973 CUNYVM (VM/ESA 2.2) 13 105487 SJUVM (VM/SP 7) 14 100553 IUBVM (VM/SP 7) 15 94102 UAFSYSB.UARK.EDU (VM/ESA 2.2) 16 85124 VTVM1 (VM/XA SP 2.1) 17 77910 JHUVM (???) 18 77251 LISTSERV.TAMU.EDU (Solaris 2.4) 19 77221 HEARN (VM/ESA 2.2) 20 76953 PEACH.EASE.LSOFT.COM (Windows NT 3.50)