[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 2 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, 1-2)

Pos Recipients  Site
--- ----------  ----
  1    2356726  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  2     893651  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  3     514745  LISTS.HAWAII.EDU (Linux 2.6.32-754.29.1.el6.x86_64)
  4     470795  ALIPES.CUMC.COLUMBIA.EDU (Linux 3.10.0-1127.8.2.el7.x86_64)
  5     398639  LISTS.PSU.EDU (AIX 6.1)
  6     374314  LISTSERV.WUSTL.EDU (Windows Server 2016 Standard x64 Edition)
  7     372643  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     362001  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  9     352951  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     298410  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 11     279445  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 12     242403  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 13     235356  LISTSERV.DOR.WA.GOV (Linux 3.10.0-1062.4.3.el7.x86_64)
 14     231865  LISTES.ULAVAL.CA (Linux 3.10.0)
 15     229547  LISTS.UFL.EDU (Linux 2.6.32)
 16     224056  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 17     219543  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 18     210439  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 19     204614  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20     192403  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)

Top 20 sites by number of subscribers (2 Jun 2020)

Pos Subscribers  Site
--- -----------  ----
  1     4847976  LISTS.PSU.EDU (AIX 6.1)
  2     4192508  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2270479  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1631149  LISTSERV.UGA.EDU (Linux 2.6.32)
  5     1454313  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1228871  LISTS.WAYNE.EDU (Linux 2.6.32)
  7     1199948  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  8     1190438  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1084742  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11     1022354  LIST.MSU.EDU (Linux 3.10.0)
 12      967232  LISTS.UMN.EDU (Linux 3.10.0)
 13      866527  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14      853296  LISTSERV.UA.EDU (Linux 4.12.14)
 15      839297  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16      810306  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      753227  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 18      746820  LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 19      739273  LISTSERV.UH.EDU (Linux 3.10.0)
 20      689794  LISTS.MAINE.EDU (Linux 3.10.0)

Top 20 sites by number of lists (2 Jun 2020)

Pos Lists  Site
--- -----  ----
  1 27554  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16569  LISTS.PSU.EDU (AIX 6.1)
  3 13898  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  7449  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8  6724  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
  9  6253  LISTSERV.UGA.EDU (Linux 2.6.32)
 10  5659  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11  5273  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 12  5092  LS.KULEUVEN.BE (Linux 2.6.32)
 13  5031  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4869  LISTS.UMN.EDU (Linux 3.10.0)
 15  4192  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 16  4128  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4069  LISTS.QUEENSU.CA (Linux 3.10.0)
 18  4013  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3647  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 20  3298  LIST.UVM.EDU (Linux 2.6.32)

Top 20 sites by volume generated daily (JUN20, 1-2)

Pos Recipients  Site
--- ----------  ----
  1    2352805  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  2     852839  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  3     514128  LISTS.HAWAII.EDU (Linux 2.6.32-754.29.1.el6.x86_64)
  4     471160  ALIPES.CUMC.COLUMBIA.EDU (Linux 3.10.0-1127.8.2.el7.x86_64)
  5     397349  LISTS.PSU.EDU (AIX 6.1)
  6     372356  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     361771  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  8     348907  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     277543  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 10     240858  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 11     235364  LISTSERV.DOR.WA.GOV (Linux 3.10.0-1062.4.3.el7.x86_64)
 12     231648  LISTES.ULAVAL.CA (Linux 3.10.0)
 13     225541  LISTS.UFL.EDU (Linux 2.6.32)
 14     216281  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 15     213430  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 16     211342  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 17     191841  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 18     183916  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19     178326  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     175175  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)

Top 20 lists by number of subscribers (2 Jun 2020)

Pos Subscribers  Site
--- -----------  ----
  1       59356  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       41796  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  5       40970  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  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       27889  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 15       27398  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)