[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 11 February 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 (FEB20, 1-11)

Pos Recipients  Site
--- ----------  ----
  1     874251  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     731010  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     365186  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     363304  LISTS.PSU.EDU (AIX 6.1)
  5     293631  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     243015  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     226780  LISTS.HAWAII.EDU (Linux 2.6.32-754.25.1.el6.x86_64)
  8     205492  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  9     204121  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 10     201433  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 11     186827  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 12     186715  LISTS.UFL.EDU (Linux 2.6.32)
 13     158430  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 14     145512  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 15     144133  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 16     138325  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 17     137256  LISTSERV.TDBANK.CA (Windows Server 2012 R2 Datacenter x64 Edition)
 18     135197  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 19     134987  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     132297  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of subscribers (11 Feb 2020)

Pos Subscribers  Site
--- -----------  ----
  1     5080814  LISTS.PSU.EDU (AIX 6.1)
  2     3924277  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2253592  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1498481  LISTSERV.UGA.EDU (Linux 2.6.32)
  5     1398745  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  7     1274051  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1220731  LISTS.WAYNE.EDU (Linux 2.6.32)
  9     1097981  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11      982099  LISTS.UMN.EDU (Linux 3.10.0)
 12      944029  LIST.MSU.EDU (Linux 3.10.0)
 13      869395  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14      852882  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 15      835364  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 16      831565  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 18      802624  LISTSERV.UA.EDU (Linux 4.12.14)
 19      785105  LISTSERV.UH.EDU (Linux 3.10.0)
 20      742830  LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of lists (11 Feb 2020)

Pos Lists  Site
--- -----  ----
  1 27669  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16540  LISTS.PSU.EDU (AIX 6.1)
  3 12853  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  7861  MARIST (VM/SP 2.0)
  8  7238  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  9  6707  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 10  6164  LISTSERV.UGA.EDU (Linux 2.6.32)
 11  5910  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 12  5467  LISTS.UMN.EDU (Linux 3.10.0)
 13  5048  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4947  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 16  4166  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 17  4082  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18  4009  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3998  LISTS.QUEENSU.CA (Linux 3.10.0)
 20  3582  LISTSERV.BUFFALO.EDU (Linux 3.10.0)

Top 20 sites by volume generated daily (FEB20, 1-11)

Pos Recipients  Site
--- ----------  ----
  1     842224  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     730138  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     359117  LISTS.PSU.EDU (AIX 6.1)
  4     353777  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     293439  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     238242  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     226342  LISTS.HAWAII.EDU (Linux 2.6.32-754.25.1.el6.x86_64)
  8     205306  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-957.12.2.el7.x86_64)
  9     199858  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 10     185163  LISTS.UFL.EDU (Linux 2.6.32)
 11     183969  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 12     165364  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 13     155799  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 14     145252  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 15     141575  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 16     132996  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 17     132785  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 18     130684  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 19     124074  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 20     115478  LIST.UVM.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (11 Feb 2020)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       59377  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       43988  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  6       36586  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33598  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       28310  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 13       28128  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 15       27399  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 16       26419  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       25008  2019-STEM-EVENT-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)
 18       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 19       24688  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 20       24438  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)