[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 15 March 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 (MAR19, 1-15)

Pos Recipients  Site
--- ----------  ----
  1     929742  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     397642  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     386095  LISTS.PSU.EDU (AIX 6.1)
  4     312635  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     290486  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  6     249036  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  7     248029  LISTES.ULAVAL.CA (Linux 3.10.0)
  8     227806  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  9     223278  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 10     220296  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
 11     217537  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 12     208066  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     195841  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     191249  LISTS.HAWAII.EDU (Linux 2.6.32-754.10.1.el6.x86_64)
 15     187613  LISTS.UFL.EDU (Linux 2.6.32)
 16     168041  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 17     166089  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 18     163379  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 19     163331  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 20     162320  LISTS.UMN.EDU (Linux 2.6.32)

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

Pos Subscribers  Site
--- -----------  ----
  1     5061893  LISTS.PSU.EDU (AIX 6.1)
  2     3787521  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2159982  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1407259  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1390352  LISTSERV.UGA.EDU (Linux 2.6.32)
  6     1373810  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     1299530  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  9     1135104  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      832778  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 14      823529  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 15      822146  LISTSERV.UA.EDU (Linux 3.0.101)
 16      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 17      814258  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      810977  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      793971  LISTSERV.UH.EDU (Linux 3.10.0)
 20      763456  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

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

Pos Lists  Site
--- -----  ----
  1 27339  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16934  LISTS.PSU.EDU (AIX 6.1)
  3 14284  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13542  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  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  7622  MARIST (VM/SP 2.0)
  9  6995  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6666  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11  5744  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5467  LISTS.UMN.EDU (Linux 2.6.32)
 13  5098  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4507  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4428  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 17  3983  LISTS.QUEENSU.CA (Solaris 2.10)
 18  3974  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3921  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3741  YORKU.CA (Linux 2.6.32)

Top 20 sites by volume generated daily (MAR19, 1-15)

Pos Recipients  Site
--- ----------  ----
  1     898283  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     396257  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     381156  LISTS.PSU.EDU (AIX 6.1)
  4     298203  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     290227  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  6     248330  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  7     247815  LISTES.ULAVAL.CA (Linux 3.10.0)
  8     224762  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  9     218118  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 10     202715  LISTSERV.UGA.EDU (Linux 2.6.32)
 11     188737  LISTS.HAWAII.EDU (Linux 2.6.32-754.10.1.el6.x86_64)
 12     185450  LISTS.UFL.EDU (Linux 2.6.32)
 13     167681  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 14     164522  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 15     163826  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     160729  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 17     160458  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 18     160025  LIST.UVM.EDU (Linux 2.6.32)
 19     159428  LISTS.UMN.EDU (Linux 2.6.32)
 20     151035  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

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

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62355  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       61860  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  4       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  5       44534  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.4.162)
  7       36554  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       33601  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 10       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 11       29608  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 12       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 13       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 14       28316  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27710  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27400  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       27079  HINDU-D@LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 19       24991  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 20       24790  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)