[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 21 October 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 (OCT18, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     804865  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     631375  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     514357  LISTS.PSU.EDU (AIX 6.1)
  4     270412  LISTES.ULAVAL.CA (Linux 2.6.18)
  5     270186  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     256872  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     251687  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  8     248130  LISTSERV.UMD.EDU (SunOS 5.10)
  9     242708  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 10     238984  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 11     237844  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12     237757  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 13     234958  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     230617  LISTS.UFL.EDU (Linux 2.6.18)
 15     208887  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 16     205790  LISTS.HAWAII.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 17     196718  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18     180135  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 19     169418  LIST.UVM.EDU (Linux 2.6.32)
 20     169039  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of subscribers (21 Oct 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5305400  LISTS.PSU.EDU (AIX 6.1)
  2     3480800  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2122192  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1355515  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5     1325355  LISTSERV.UGA.EDU (Linux 2.6.32)
  6     1318220  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  7     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
  8     1277090  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1150284  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11      990082  LISTS.UMN.EDU (Linux 2.6.32)
 12      944029  LIST.MSU.EDU (Linux 3.10.0)
 13      831072  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 14      825842  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      792930  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      783040  LISTSERV.UA.EDU (Linux 3.0.101)
 18      780872  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      753301  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      732710  LISTSERV.UH.EDU (Linux 3.10.0)

Top 20 sites by number of lists (21 Oct 2018)

Pos Lists  Site
--- -----  ----
  1 27267  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16947  LISTS.PSU.EDU (AIX 6.1)
  3 14203  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 11267  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  6  9599  LISTS.UFL.EDU (Linux 2.6.18)
  7  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  7580  MARIST (VM/SP 2.0)
  9  6741  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6622  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11  5572  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5515  LISTS.UMN.EDU (Linux 2.6.32)
 13  5114  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4447  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 16  4356  LS.KULEUVEN.BE (Linux 2.6.32)
 17  3938  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 18  3906  LISTS.QUEENSU.CA (Solaris 2.10)
 19  3857  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3690  YORKU.CA (Linux 2.6.32)

Top 20 sites by volume generated daily (OCT18, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     776226  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     630460  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     509247  LISTS.PSU.EDU (AIX 6.1)
  4     270292  LISTES.ULAVAL.CA (Linux 2.6.18)
  5     258259  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     250855  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     242665  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8     238469  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  9     234823  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 10     232578  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 11     229268  LISTS.UFL.EDU (Linux 2.6.18)
 12     223509  LISTSERV.UMD.EDU (SunOS 5.10)
 13     205814  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 14     205658  LISTS.HAWAII.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 15     194131  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     185035  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17     177391  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 18     167958  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19     167746  LIST.UVM.EDU (Linux 2.6.32)
 20     165085  LIST.UNM.EDU (Linux 2.6.32-696.23.1.el6.x86_64)

Top 20 lists by number of subscribers (21 Oct 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62396  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       62185  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  4       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  5       42030  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6       41762  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  7       35693  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       33604  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 10       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 11       29239  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 12       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 13       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 14       28321  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27405  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       27079  HINDU-D@LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 19       25143  CANVASSTUDENTS_AUTO@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)