[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – April 2018


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 (APR18, 1-30)

Pos Recipients  Site
--- ----------  ----
  1     777552  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     692020  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     481499  LISTS.PSU.EDU (AIX 6.1)
  4     300432  LSERV.CARDSYS.AT (Linux 4.4.98-6-pve)
  5     291284  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     267185  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     254152  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  8     248524  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  9     244998  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 10     235691  LISTES.ULAVAL.CA (Linux 2.6.18)
 11     235377  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
 12     233909  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     229737  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     229193  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 15     205133  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 16     203291  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 17     199357  LISTSERV.UMD.EDU (SunOS 5.10)
 18     196117  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition + LSMTP V1.1b)
 19     194729  LISTS.UFL.EDU (Linux 2.6.18)
 20     175443  LIST.UVM.EDU (Linux 2.6.32)

Top 20 sites by number of subscribers (30 Apr 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5232506  LISTS.PSU.EDU (AIX 6.1)
  2     4141308  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2044325  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1558931  LISTS.WAYNE.EDU (Linux 2.6.32)
  5     1426972  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1375464  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     1350030  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  8     1332007  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1039045  LISTSERV.UH.EDU (Linux 3.10.0)
 12     1034819  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 13      998260  LISTS.UMN.EDU (Linux 2.6.32)
 14      944029  LIST.MSU.EDU (Linux 3.10.0)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      787826  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17      775003  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      772856  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      752223  LISTSERV.UA.EDU (Linux 3.0.101)
 20      729276  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of lists (30 Apr 2018)

Pos Lists  Site
--- -----  ----
  1 30443  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 15723  LISTS.PSU.EDU (AIX 6.1)
  3 14785  LISTSERV.UH.EDU (Linux 3.10.0)
  4 14088  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5 13473  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  7  9599  LISTS.UFL.EDU (Linux 2.6.18)
  8  8029  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  7372  MARIST (VM/SP 2.0)
 10  6836  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11  6601  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12  6482  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 13  5721  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 14  5498  LISTS.UMN.EDU (Linux 2.6.32)
 15  5329  LISTSERV.UGA.EDU (Linux 2.6.32)
 16  4422  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 18  4200  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3895  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3792  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (APR18, 1-30)

Pos Recipients  Site
--- ----------  ----
  1     750864  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     690554  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     476671  LISTS.PSU.EDU (AIX 6.1)
  4     278742  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     264278  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     249409  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     244931  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8     235544  LISTES.ULAVAL.CA (Linux 2.6.18)
  9     228534  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     228258  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 11     224365  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 12     200380  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 13     200050  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     195540  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition + LSMTP V1.1b)
 15     192491  LISTS.UFL.EDU (Linux 2.6.18)
 16     178160  LISTSERV.UMD.EDU (SunOS 5.10)
 17     173773  LIST.UVM.EDU (Linux 2.6.32)
 18     166941  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19     159479  LISTS.UMN.EDU (Linux 2.6.32)
 20     150854  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 lists by number of subscribers (30 Apr 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62435  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41758  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       38845  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       35721  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33609  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  9       30836  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 10       29086  IONIEUWSBRIEF@LS.KULEUVEN.BE (Linux 2.6.32)
 11       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 12       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 13       28758  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       28335  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27411  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 18       25295  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 19       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 20       23825  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)