[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 22 January 2022


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 (JAN22, 1-22)

Pos Recipients  Site
--- ----------  ----
  1     767011  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     365185  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  3     331430  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  4     328448  LISTS.PSU.EDU (Linux 3.10.0)
  5     275559  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     241634  LISTS.HAWAII.EDU (Linux 3.10.0-1160.49.1.el7.x86_64)
  7     238063  LISTSERV.ACM.ORG (Windows Server 2016 Datacenter x64 Edition)
  8     213231  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  9     183066  LISTSERV.REDIRIS.ES (Linux 3.10.0-1062.9.1.el7.x86_64)
 10     178200  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 11     170315  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 12     169240  LISTS.UFL.EDU (Linux 2.6.32)
 13     166907  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 14     159186  LISTSERV.TDBANK.CA (Windows Server 2016 Datacenter x64 Edition)
 15     153979  LISTSERV.UA.EDU (Linux 4.12.14)
 16     148336  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 17     143043  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 18     117069  LISTS.ROCHESTER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19     116536  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 20     111439  LISTSERV.ICORS.ORG (Windows Server 2016 Datacenter x64 Edition)

Top 20 sites by number of subscribers (22 Jan 2022)

Pos Subscribers  Site
--- -----------  ----
  1     5434933  LISTS.PSU.EDU (Linux 3.10.0)
  2     4682970  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     1777535  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4     1716943  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  5     1506168  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  6     1247986  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     1170614  LISTSERV.UA.EDU (Linux 4.12.14)
  8     1059036  LISTS.UFL.EDU (Linux 2.6.32)
  9     1032750  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 10     1026065  LISTS.WAYNE.EDU (Linux 2.6.32)
 11      992106  LIST.MSU.EDU (Linux 3.10.0)
 12      925150  LISTS.UMN.EDU (Linux 3.10.0)
 13      862521  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 14      853488  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      850148  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16      837910  LISTSERV.ECU.EDU (Windows Server 2016 Standard x64 Edition)
 17      833150  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 18      814345  LISTSERV.UH.EDU (Linux 3.10.0)
 19      700231  LISTSERV.LIV.AC.UK (Linux 3.10.0)
 20      682447  LISTS.QUEENSU.CA (Linux 3.10.0)

Top 20 sites by number of lists (22 Jan 2022)

Pos Lists  Site
--- -----  ----
  1 27887  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16528  LISTS.PSU.EDU (Linux 3.10.0)
  3 14174  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  7136  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  8  6763  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
  9  6167  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 10  5186  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 11  4987  LISTSERV.TAMU.EDU (Linux 3.0.101)
 12  4809  LISTS.UMN.EDU (Linux 3.10.0)
 13  4415  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 14  4239  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 15  3818  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16  3771  LISTS.QUEENSU.CA (Linux 3.10.0)
 17  3430  LISTSERV.BROWN.EDU (Linux 3.10.0)
 18  3407  LIST.UVM.EDU (Linux 2.6.32)
 19  3290  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 20  2774  LISTSERV.KENT.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by volume generated daily (JAN22, 1-22)

Pos Recipients  Site
--- ----------  ----
  1     737486  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     357019  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  3     330944  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  4     325392  LISTS.PSU.EDU (Linux 3.10.0)
  5     275366  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     239062  LISTS.HAWAII.EDU (Linux 3.10.0-1160.49.1.el7.x86_64)
  7     209047  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  8     181089  LISTSERV.REDIRIS.ES (Linux 3.10.0-1062.9.1.el7.x86_64)
  9     177999  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 10     168159  LISTS.UFL.EDU (Linux 2.6.32)
 11     163519  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 12     150944  LISTSERV.UA.EDU (Linux 4.12.14)
 13     148121  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 14     140903  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 15     119399  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 16     116618  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 17     109731  LISTSERV.ICORS.ORG (Windows Server 2016 Datacenter x64 Edition)
 18     106577  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.45.1.el7.x86_64)
 19     105706  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 20     102602  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)

Top 20 lists by number of subscribers (22 Jan 2022)

Pos Subscribers  Site
--- -----------  ----
  1       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  2       41927  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2019 Datacenter x64 Edition)
  3       41816  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  4       39350  SUCCESS@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  5       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  6       33786  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       31621  TAU-STU-ACADEMICSEC-STUDENTS@LISTSERV.TAU.AC.IL (Linux 2.6.9)
  8       30225  UG2021FALL@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  9       28887  TAU-INNOVTL-ALL-STUDENTS@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 10       28276  L-THON-NEWS@LISTS.PSU.EDU (Linux 3.10.0)
 11       27706  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 12       27582  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 13       27479  TAU4U@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 14       27380  VOLUPDATE@LISTSERV.UTK.EDU (Linux 3.10.0)
 15       27348  UTENNSRP@LISTSERV.UTK.EDU (Linux 3.10.0)
 16       26421  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 18       24633  ECF-MIWD@NYED.USCOURTS.GOV (Linux 3.10.0)
 19       24288  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20       22770  STUDENT-TRAVEL-SURVEY-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)