[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 16 September 2021


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 (SEP21, 1-16)

Pos Recipients  Site
--- ----------  ----
  1     892473  LISTSERV.TAMU.EDU (Linux 3.0.101)
  2     762068  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  3     383895  LISTS.PSU.EDU (Linux 3.10.0)
  4     324805  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  5     273123  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     262984  LISTS.HAWAII.EDU (Linux 3.10.0-1160.36.2.el7.x86_64)
  7     230242  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  8     229541  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.31.1.el7.x86_64)
  9     205259  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 10     203616  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 11     193847  LISTS.UFL.EDU (Linux 2.6.32)
 12     183946  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 13     179735  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 14     170676  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 15     164513  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 16     163468  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 17     162395  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 18     151107  LISTSERV.REDIRIS.ES (Linux 3.10.0-1062.9.1.el7.x86_64)
 19     120795  LISTS.ROCHESTER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     120750  LISTSERV.UA.EDU (Linux 4.12.14)

Top 20 sites by number of subscribers (16 Sep 2021)

Pos Subscribers  Site
--- -----------  ----
  1     5084737  LISTS.PSU.EDU (Linux 3.10.0)
  2     4608972  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     1777535  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4     1649175  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  5     1325843  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  6     1247397  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     1069753  LISTS.WAYNE.EDU (Linux 2.6.32)
  8     1059036  LISTS.UFL.EDU (Linux 2.6.32)
  9     1040843  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 10     1023784  LISTSERV.UA.EDU (Linux 4.12.14)
 11      925597  LISTS.UMN.EDU (Linux 3.10.0)
 12      909696  LIST.MSU.EDU (Linux 3.10.0)
 13      876268  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 14      853488  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      844757  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 16      840432  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 17      825628  LISTSERV.UH.EDU (Linux 3.10.0)
 18      816571  LISTSERV.ECU.EDU (Windows Server 2016 Standard x64 Edition)
 19      666328  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 20      641837  LISTS.QUEENSU.CA (Linux 3.10.0)

Top 20 sites by number of lists (16 Sep 2021)

Pos Lists  Site
--- -----  ----
  1 27783  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16444  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  7628  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  8  6756  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
  9  6033  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 10  5088  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 11  4992  LISTSERV.TAMU.EDU (Linux 3.0.101)
 12  4829  LISTS.UMN.EDU (Linux 3.10.0)
 13  4367  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 14  4198  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 15  3840  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16  3752  LISTS.QUEENSU.CA (Linux 3.10.0)
 17  3478  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 18  3390  LISTSERV.BROWN.EDU (Linux 3.10.0)
 19  3366  LIST.UVM.EDU (Linux 2.6.32)
 20  2775  LISTSERV.KENT.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by volume generated daily (SEP21, 1-16)

Pos Recipients  Site
--- ----------  ----
  1     884390  LISTSERV.TAMU.EDU (Linux 3.0.101)
  2     730167  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  3     380826  LISTS.PSU.EDU (Linux 3.10.0)
  4     317334  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  5     272970  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     262079  LISTS.HAWAII.EDU (Linux 3.10.0-1160.36.2.el7.x86_64)
  7     229286  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.31.1.el7.x86_64)
  8     226273  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  9     203198  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 10     192088  LISTS.UFL.EDU (Linux 2.6.32)
 11     180611  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 12     177318  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 13     170445  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 14     162184  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 15     159905  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16     153268  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 17     148809  LISTSERV.REDIRIS.ES (Linux 3.10.0-1062.9.1.el7.x86_64)
 18     117584  LISTSERV.UA.EDU (Linux 4.12.14)
 19     117452  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 20     111676  LIST.MSU.EDU (Linux 3.10.0)

Top 20 lists by number of subscribers (16 Sep 2021)

Pos Subscribers  Site
--- -----------  ----
  1       59192  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  2       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  3       41911  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2019 Datacenter x64 Edition)
  4       41813  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  5       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  6       33984  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       31621  TAU-STU-ACADEMICSEC-STUDENTS@LISTSERV.TAU.AC.IL (Linux 2.6.9)
  8       28887  TAU-INNOVTL-ALL-STUDENTS@LISTSERV.TAU.AC.IL (Linux 2.6.9)
  9       28686  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 10       28286  L-THON-NEWS@LISTS.PSU.EDU (Linux 3.10.0)
 11       27707  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 12       27479  TAU4U@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 13       27381  VOLUPDATE@LISTSERV.UTK.EDU (Linux 3.10.0)
 14       27348  UTENNSRP@LISTSERV.UTK.EDU (Linux 3.10.0)
 15       26421  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 16       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 17       24556  ECF-MIWD@NYED.USCOURTS.GOV (Linux 3.10.0)
 18       24288  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19       22770  STUDENT-TRAVEL-SURVEY-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)
 20       21994  PRESIDENT-WELCOME@LISTSERV.TAU.AC.IL (Linux 2.6.9)