[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 15 September 2019


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:

In addition, you can view a list of the Top 20 lists in the network (by number of subscribers).

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 daily (SEP19, 1-15)

Pos Recipients  Site
--- ----------  ----
  1     945415  LISTSERV.TAMU.EDU (Linux 3.0.101)
  2     659779  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  3     409838  LISTS.PSU.EDU (AIX 6.1)
  4     235467  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  5     233473  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  6     226222  LISTES.ULAVAL.CA (Linux 3.10.0)
  7     223055  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8     218929  LIST.UNM.EDU (Linux 2.6.32-754.12.1.el6.x86_64)
  9     216361  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 10     213211  LISTSERV.UGA.EDU (Linux 2.6.32)
 11     209914  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 12     196243  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 13     191786  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     184567  LISTS.HAWAII.EDU (Linux 2.6.32-754.17.1.el6.x86_64)
 15     182766  LISTS.UFL.EDU (Linux 2.6.32)
 16     177150  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 17     169145  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18     158369  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 19     145794  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     137239  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of subscribers (15 Sep 2019)

Pos Subscribers  Site
--- -----------  ----
  1     5240300  LISTS.PSU.EDU (AIX 6.1)
  2     3849486  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2226848  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1478469  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1387437  LISTSERV.UGA.EDU (Linux 2.6.32)
  6     1379256  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     1302751  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  9     1238554  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11      982099  LISTS.UMN.EDU (Linux 2.6.32)
 12      944029  LIST.MSU.EDU (Linux 3.10.0)
 13      855418  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 14      855320  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      843848  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 16      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 17      795988  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      791377  LISTSERV.UH.EDU (Linux 3.10.0)
 19      782949  LISTSERV.UA.EDU (Linux 3.0.101)
 20      707537  LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of lists (15 Sep 2019)

Pos Lists  Site
--- -----  ----
  1 27383  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16677  LISTS.PSU.EDU (AIX 6.1)
  3 14093  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4 11375  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  6  9599  LISTS.UFL.EDU (Linux 2.6.32)
  7  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  7918  MARIST (VM/SP 2.0)
  9  7106  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6695  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 11  5983  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5467  LISTS.UMN.EDU (Linux 2.6.32)
 13  5059  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4633  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 16  4263  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4019  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 18  3998  LISTS.QUEENSU.CA (Linux 3.10.0)
 19  3996  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3532  LISTSERV.BUFFALO.EDU (Linux 3.10.0)

Top 20 sites by volume generated daily (SEP19, 1-15)

Pos Recipients  Site
--- ----------  ----
  1     944025  LISTSERV.TAMU.EDU (Linux 3.0.101)
  2     632428  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  3     405507  LISTS.PSU.EDU (AIX 6.1)
  4     233233  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  5     226095  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     218711  LIST.UNM.EDU (Linux 2.6.32-754.12.1.el6.x86_64)
  7     215191  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8     213722  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  9     207504  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     207404  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11     191357  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 12     183557  LISTS.HAWAII.EDU (Linux 2.6.32-754.17.1.el6.x86_64)
 13     181831  LISTS.UFL.EDU (Linux 2.6.32)
 14     176584  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 15     164207  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     158080  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 17     156161  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18     145653  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19     134946  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 20     118930  LIST.UVM.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (15 Sep 2019)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       61481  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       43325  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  6       36541  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33603  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  9       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 10       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 11       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 12       28313  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 13       28025  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 15       27399  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 16       26419  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       25008  2019-STEM-EVENT-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)
 18       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 19       24766  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 20       24482  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)