[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – July 2019


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 (JUL19, 1-25)

Pos Recipients  Site
--- ----------  ----
  1     702937  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     227125  LISTS.PSU.EDU (AIX 6.1)
  3     206381  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  4     204978  LISTSERV.TAMU.EDU (Linux 3.0.101)
  5     190143  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  6     172917  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  7     169673  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  8     144608  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  9     138735  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     134477  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 11     132460  LISTSERV.UA.EDU (Linux 3.0.101)
 12     124802  LISTS.UFL.EDU (Linux 2.6.32)
 13     120486  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 14     120122  LIST.UVM.EDU (Linux 2.6.32)
 15     118643  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     112256  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 17     111646  LISTS.HAWAII.EDU (Linux 2.6.32-754.17.1.el6.x86_64)
 18     107777  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19     105438  LISTSERV.TDBANK.CA (Windows Server 2012 R2 Datacenter x64 Edition)
 20     101904  OCLCLISTS.ORG (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of subscribers (25 Jul 2019)

Pos Subscribers  Site
--- -----------  ----
  1     5073227  LISTS.PSU.EDU (AIX 6.1)
  2     3675479  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2180398  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1441191  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5     1432858  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1408875  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  8     1273971  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1143126  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11      982099  LISTS.UMN.EDU (Linux 2.6.32)
 12      944029  LIST.MSU.EDU (Linux 3.10.0)
 13      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 14      804944  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 15      804714  LISTSERV.UA.EDU (Linux 3.0.101)
 16      774256  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      750105  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 18      746151  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      745882  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      738807  LISTSERV.UH.EDU (Linux 3.10.0)

Top 20 sites by number of lists (25 Jul 2019)

Pos Lists  Site
--- -----  ----
  1 27490  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16825  LISTS.PSU.EDU (AIX 6.1)
  3 14243  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 14009  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  6  9599  LISTS.UFL.EDU (Linux 2.6.32)
  7  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  7668  MARIST (VM/SP 2.0)
  9  7056  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6681  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 11  5897  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5467  LISTS.UMN.EDU (Linux 2.6.32)
 13  5074  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4603  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 16  4342  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  3998  LISTS.QUEENSU.CA (Linux 3.10.0)
 18  3982  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3939  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3486  LISTSERV.BUFFALO.EDU (Linux 3.10.0)

Top 20 sites by volume generated daily (JUL19, 1-25)

Pos Recipients  Site
--- ----------  ----
  1     676040  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     222777  LISTS.PSU.EDU (AIX 6.1)
  3     203875  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     167354  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  5     166221  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     144488  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  7     135718  LISTSERV.UGA.EDU (Linux 2.6.32)
  8     130791  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
  9     127604  LISTSERV.UA.EDU (Linux 3.0.101)
 10     123625  LISTS.UFL.EDU (Linux 2.6.32)
 11     118670  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 12     118295  LIST.UVM.EDU (Linux 2.6.32)
 13     115837  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     110323  LISTS.HAWAII.EDU (Linux 2.6.32-754.17.1.el6.x86_64)
 15     109975  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 16      99387  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 17      98695  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 18      97220  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      97161  LISTS.VATRAFFIC.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 20      94130  LISTS.UMN.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (25 Jul 2019)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       61613  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       49043  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  6       36548  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33602  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       28436  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 13       28316  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 14       27710  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 15       27401  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 16       26418  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       24765  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 20       24492  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)