[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – June 2020


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 (JUN20, 1-30)

Pos Recipients  Site
--- ----------  ----
  1     947804  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  2     847373  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  3     324313  LISTS.PSU.EDU (AIX 6.1)
  4     229459  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  5     214222  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     191213  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  7     189934  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  8     166350  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     161470  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 10     159027  LISTS.UFL.EDU (Linux 2.6.32)
 11     158826  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 12     157478  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     153859  LISTS.HAWAII.EDU (Linux 2.6.32-754.29.2.el6.x86_64)
 14     149949  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 15     145867  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16     145756  LISTSERV.UA.EDU (Linux 4.12.14)
 17     140271  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 18     139274  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 19     132010  LISTES.ULAVAL.CA (Linux 3.10.0)
 20     122272  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of subscribers (30 Jun 2020)

Pos Subscribers  Site
--- -----------  ----
  1     4847976  LISTS.PSU.EDU (AIX 6.1)
  2     4176506  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2286921  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1642476  LISTSERV.UGA.EDU (Linux 2.6.32)
  5     1455765  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1229821  LISTS.WAYNE.EDU (Linux 2.6.32)
  7     1208933  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  8     1208539  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1087634  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11     1029106  LIST.MSU.EDU (Linux 3.10.0)
 12      972445  LISTS.UMN.EDU (Linux 3.10.0)
 13      854813  LISTSERV.UA.EDU (Linux 4.12.14)
 14      838962  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 15      826059  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16      814791  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      761803  LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 18      757457  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 19      747365  LISTSERV.UH.EDU (Linux 3.10.0)
 20      721624  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of lists (30 Jun 2020)

Pos Lists  Site
--- -----  ----
  1 27608  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16569  LISTS.PSU.EDU (AIX 6.1)
  3 14042  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  5  9599  LISTS.UFL.EDU (Linux 2.6.32)
  6  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  7  7458  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8  6722  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
  9  6269  LISTSERV.UGA.EDU (Linux 2.6.32)
 10  5643  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11  5382  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 12  5118  LS.KULEUVEN.BE (Linux 2.6.32)
 13  5031  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4872  LISTS.UMN.EDU (Linux 3.10.0)
 15  4191  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 16  4141  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4096  LISTS.QUEENSU.CA (Linux 3.10.0)
 18  4019  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3659  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 20  3301  LIST.UVM.EDU (Linux 2.6.32)

Top 20 sites by volume generated daily (JUN20, 1-30)

Pos Recipients  Site
--- ----------  ----
  1     946280  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  2     817460  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  3     321658  LISTS.PSU.EDU (AIX 6.1)
  4     229290  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  5     206957  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     188997  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  7     165398  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     157227  LISTS.UFL.EDU (Linux 2.6.32)
  9     156818  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 10     154050  LISTSERV.UGA.EDU (Linux 2.6.32)
 11     153513  LISTS.HAWAII.EDU (Linux 2.6.32-754.29.2.el6.x86_64)
 12     149598  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 13     141699  LISTSERV.UA.EDU (Linux 4.12.14)
 14     140875  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 15     140062  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 16     137860  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 17     131794  LISTES.ULAVAL.CA (Linux 3.10.0)
 18     126055  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19     121243  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     116504  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)

Top 20 lists by number of subscribers (30 Jun 2020)

Pos Subscribers  Site
--- -----------  ----
  1       59352  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  2       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  3       52531  ECF-EDNY@NYED.USCOURTS.GOV (Linux 3.10.0)
  4       45168  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5       41799  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  6       36455  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33596  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       28309  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 13       27823  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 15       27390  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 16       26419  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       25522  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 18       25010  2019-STEM-EVENT-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)
 19       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 20       24350  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)