[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – May 2018


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 (MAY18, 1-30)

Pos Recipients  Site
--- ----------  ----
  1     792931  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     303313  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  3     301236  LISTS.PSU.EDU (AIX 6.1)
  4     273238  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition + LSMTP V1.1b)
  5     262298  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  6     254577  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     233331  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  8     213420  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  9     203783  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 10     199237  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11     191644  LISTSERV.TAMU.EDU (Linux 3.0.101)
 12     187137  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 13     184248  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     176006  LSERV.CARDSYS.AT (Linux 4.4.98-6-pve)
 15     167181  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16     158422  LISTSERV.UGA.EDU (Linux 2.6.32)
 17     153884  LISTES.ULAVAL.CA (Linux 2.6.18)
 18     152300  LISTSERV.UA.EDU (Linux 3.0.101)
 19     148463  LISTS.UFL.EDU (Linux 2.6.18)
 20     146344  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of subscribers (30 May 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5255737  LISTS.PSU.EDU (AIX 6.1)
  2     3562698  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2090160  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1533989  LISTS.WAYNE.EDU (Linux 2.6.32)
  5     1425646  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1357191  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  7     1340854  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1339480  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1029130  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12      999929  LISTS.UMN.EDU (Linux 2.6.32)
 13      944029  LIST.MSU.EDU (Linux 3.10.0)
 14      877792  LISTSERV.UH.EDU (Linux 3.10.0)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      788511  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      762151  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      734168  LISTSERV.UA.EDU (Linux 3.0.101)
 19      696131  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      693501  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of lists (30 May 2018)

Pos Lists  Site
--- -----  ----
  1 27231  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16068  LISTS.PSU.EDU (AIX 6.1)
  3 14117  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13528  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  6  9599  LISTS.UFL.EDU (Linux 2.6.18)
  7  8173  LISTSERV.UH.EDU (Linux 3.10.0)
  8  8049  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  7223  MARIST (VM/SP 2.0)
 10  6840  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11  6609  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12  6489  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 13  5721  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 14  5498  LISTS.UMN.EDU (Linux 2.6.32)
 15  5351  LISTSERV.UGA.EDU (Linux 2.6.32)
 16  4422  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 18  4229  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3898  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3800  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (MAY18, 1-30)

Pos Recipients  Site
--- ----------  ----
  1     764003  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     296326  LISTS.PSU.EDU (AIX 6.1)
  3     289998  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     272407  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition + LSMTP V1.1b)
  5     250299  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  6     227610  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  7     203555  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  8     196112  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  9     190323  LISTSERV.TAMU.EDU (Linux 3.0.101)
 10     184006  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 11     167144  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12     154809  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     153734  LISTES.ULAVAL.CA (Linux 2.6.18)
 14     149121  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15     147268  LISTSERV.UA.EDU (Linux 3.0.101)
 16     146146  LISTS.UFL.EDU (Linux 2.6.18)
 17     142892  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 18     135459  LISTS.UMN.EDU (Linux 2.6.32)
 19     134168  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 20     129846  LIST.UVM.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (30 May 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62426  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41759  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       38798  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       35718  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33609  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  9       30836  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 10       28980  IONIEUWSBRIEF@LS.KULEUVEN.BE (Linux 2.6.32)
 11       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 12       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 13       28515  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       28335  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27787  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 16       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17       27408  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 18       27080  HINDU-D@LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 20       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)