[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – July 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 (JUL95)

Pos Recipients Site --- ---------- ---- 1 472082 UGA (VM/ESA 2.1) 2 365714 UBVM (VM/ESA 2.2) 3 268730 PSUVM (VM/ESA 2.2) 4 171531 UKCC (VM/ESA 2.2) 5 164743 LISTSERV.TAMU.EDU (Solaris 2.4) 6 163283 NDSUVM1 (VM/ESA 2.2) 7 148838 LISTSERV.BROWN.EDU (Ultrix 4.2) 8 138360 PEACH.EASE.LSOFT.COM (Windows NT 3.50) 9 126857 LISTSERV.SYR.EDU (Solaris 2.4) 10 112200 DEARN (VM/ESA 1.1) 11 109768 AMERICAN.EDU (AIX 3.2.4) 12 93452 SJUVM (VM/SP 7) 13 89196 CUNYVM (VM/ESA 2.2) 14 87811 HEARN (VM/ESA 2.2) 15 80122 UMDD (VM/HPO 5.0) 16 79739 UAFSYSB.UARK.EDU (VM/ESA 2.2) 17 76762 LISTSERV.DARTMOUTH.EDU (AIX 3.2.5) 18 74732 SEGATE (OpenVMS V6.1) 19 73853 MSU.EDU (VM/XA SP 2.1) 20 73016 UCBCMSA (VM/ESA 2.1)

Top 20 sites by volume generated (JUL95)

Pos Recipients Site --- ---------- ---- 1 283345 UBVM (VM/ESA 2.2) 2 267252 PSUVM (VM/ESA 2.2) 3 174827 BROWNVM (VM/ESA 1.1) 4 170097 UKCC (VM/ESA 2.2) 5 164464 NDSUVM1 (VM/ESA 2.2) 6 155017 PEACH.EASE.LSOFT.COM (Windows NT 3.50) 7 148036 TAMVM1.TAMU.EDU (VM/HPO 6.0) 8 127171 LISTSERV.SYR.EDU (Solaris 2.4) 9 122030 AMERICAN.EDU (AIX 3.2.4) 10 102452 SJUVM (VM/SP 7) 11 97666 UGA (VM/ESA 2.1) 12 96628 CUNYVM (VM/ESA 2.2) 13 92571 UMDD (VM/HPO 5.0) 14 87604 TREARN (VM/XA SP 2.1) 15 86205 MSU.EDU (VM/XA SP 2.1) 16 80993 UAFSYSB.UARK.EDU (VM/ESA 2.2) 17 79841 LISTSERV.DARTMOUTH.EDU (AIX 3.2.5) 18 77221 IUBVM (VM/SP 7) 19 74832 HEARN (VM/ESA 2.2) 20 71139 UA1VM.UA.EDU (VM/ESA 2.2)