[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 16 November 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 (NOV19, 1-16)

Pos Recipients  Site
--- ----------  ----
  1     821704  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     625164  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     436024  LISTS.PSU.EDU (AIX 6.1)
  4     389680  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  5     337312  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     322165  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  7     257809  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  8     224239  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     220471  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 10     216159  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
 11     203422  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 12     199657  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 13     192221  LISTS.HAWAII.EDU (Linux 2.6.32-754.23.1.el6.x86_64)
 14     177548  LISTS.UFL.EDU (Linux 2.6.32)
 15     168715  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16     167448  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 17     162511  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 18     156413  LISTSERV.UA.EDU (Linux 4.12.14)
 19     151538  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 20     136301  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of subscribers (16 Nov 2019)

Pos Subscribers  Site
--- -----------  ----
  1     5040880  LISTS.PSU.EDU (AIX 6.1)
  2     3966638  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2229614  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1432099  LISTSERV.UGA.EDU (Linux 2.6.32)
  5     1373349  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1303957  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  8     1235919  LISTS.WAYNE.EDU (Linux 2.6.32)
  9     1143286  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 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      851013  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 14      849522  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 15      842856  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 17      813137  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      798133  LISTSERV.UH.EDU (Linux 3.10.0)
 19      778159  LISTSERV.UA.EDU (Linux 4.12.14)
 20      736589  LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of lists (16 Nov 2019)

Pos Lists  Site
--- -----  ----
  1 27602  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16713  LISTS.PSU.EDU (AIX 6.1)
  3 11984  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  5  9649  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6  9599  LISTS.UFL.EDU (Linux 2.6.32)
  7  8344  MARIST (VM/SP 2.0)
  8  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  7210  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6702  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 11  6071  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5467  LISTS.UMN.EDU (Linux 2.6.32)
 13  5050  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4789  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 16  4185  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4041  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18  4026  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3998  LISTS.QUEENSU.CA (Linux 3.10.0)
 20  3548  LISTSERV.BUFFALO.EDU (Linux 3.10.0)

Top 20 sites by volume generated daily (NOV19, 1-16)

Pos Recipients  Site
--- ----------  ----
  1     790947  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     624726  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     432036  LISTS.PSU.EDU (AIX 6.1)
  4     388810  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  5     337154  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     312969  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  7     219459  LISTSERV.UGA.EDU (Linux 2.6.32)
  8     215970  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  9     215584  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 10     203341  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 11     200277  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 12     196930  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 13     189937  LISTS.HAWAII.EDU (Linux 2.6.32-754.23.1.el6.x86_64)
 14     175558  LISTS.UFL.EDU (Linux 2.6.32)
 15     168529  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16     159242  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 17     151616  LISTSERV.UA.EDU (Linux 4.12.14)
 18     151231  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 19     133450  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 20     128213  LISTSERV.UTORONTO.CA (Linux 3.10.0)

Top 20 lists by number of subscribers (16 Nov 2019)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       59430  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       43481  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  6       37567  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33600  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       28311  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 13       28002  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       24455  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)