[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 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, 1-24)

Pos Recipients  Site
--- ----------  ----
  1     715475  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     340582  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  3     328369  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  4     304436  LISTS.PSU.EDU (Linux 3.10.0)
  5     252613  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     230089  LISTS.HAWAII.EDU (Linux 3.10.0-1160.49.1.el7.x86_64)
  7     221129  LISTSERV.ACM.ORG (Windows Server 2016 Datacenter x64 Edition)
  8     197272  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  9     172374  LISTSERV.REDIRIS.ES (Linux 3.10.0-1062.9.1.el7.x86_64)
 10     164394  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 11     159635  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 12     157176  LISTS.UFL.EDU (Linux 2.6.32)
 13     155343  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 14     148679  LISTSERV.TDBANK.CA (Windows Server 2016 Datacenter x64 Edition)
 15     144070  LISTSERV.UA.EDU (Linux 4.12.14)
 16     135678  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 17     135332  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 18     115791  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.45.1.el7.x86_64)
 19     110916  LISTS.ROCHESTER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     109629  LISTSERV.ICORS.ORG (Windows Server 2016 Datacenter x64 Edition)

Top 20 sites by number of subscribers (24 Jan 2022)

Pos Subscribers  Site
--- -----------  ----
  1     5455394  LISTS.PSU.EDU (Linux 3.10.0)
  2     4680343  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     1777535  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4     1717320  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  5     1509167  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  6     1258355  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     1170761  LISTSERV.UA.EDU (Linux 4.12.14)
  8     1059036  LISTS.UFL.EDU (Linux 2.6.32)
  9     1032529  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 10     1030512  LISTS.WAYNE.EDU (Linux 2.6.32)
 11      991722  LIST.MSU.EDU (Linux 3.10.0)
 12      925632  LISTS.UMN.EDU (Linux 3.10.0)
 13      863711  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 14      853488  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      850760  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16      837835  LISTSERV.ECU.EDU (Windows Server 2016 Standard x64 Edition)
 17      836531  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 18      814325  LISTSERV.UH.EDU (Linux 3.10.0)
 19      700233  LISTSERV.LIV.AC.UK (Linux 3.10.0)
 20      682510  LISTS.QUEENSU.CA (Linux 3.10.0)

Top 20 sites by number of lists (24 Jan 2022)

Pos Lists  Site
--- -----  ----
  1 27906  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16535  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  6170  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 10  5189  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 11  4988  LISTSERV.TAMU.EDU (Linux 3.0.101)
 12  4809  LISTS.UMN.EDU (Linux 3.10.0)
 13  4422  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 14  4237  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 15  3819  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16  3771  LISTS.QUEENSU.CA (Linux 3.10.0)
 17  3431  LISTSERV.BROWN.EDU (Linux 3.10.0)
 18  3408  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, 1-24)

Pos Recipients  Site
--- ----------  ----
  1     687153  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     332712  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  3     327887  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  4     301426  LISTS.PSU.EDU (Linux 3.10.0)
  5     252423  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     227734  LISTS.HAWAII.EDU (Linux 3.10.0-1160.49.1.el7.x86_64)
  7     193340  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  8     170469  LISTSERV.REDIRIS.ES (Linux 3.10.0-1062.9.1.el7.x86_64)
  9     164199  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 10     156087  LISTS.UFL.EDU (Linux 2.6.32)
 11     152022  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 12     141100  LISTSERV.UA.EDU (Linux 4.12.14)
 13     135471  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 14     133164  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 15     115725  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.45.1.el7.x86_64)
 16     112638  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 17     108548  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 18     107925  LISTSERV.ICORS.ORG (Windows Server 2016 Datacenter x64 Edition)
 19     103929  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 20      98435  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)

Top 20 lists by number of subscribers (24 Jan 2022)

Pos Subscribers  Site
--- -----------  ----
  1       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  2       41953  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2019 Datacenter x64 Edition)
  3       41816  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  4       39349  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       30223  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       27579  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 13       27479  TAU4U@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 14       27379  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)