[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 4 August 2017


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 (AUG17, 1-4)

Pos Recipients  Site
--- ----------  ----
  1     809039  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     417795  LSERV.CARDSYS.AT (Linux 4.4.59-1-pve)
  3     368023  LISTS.PSU.EDU (AIX 6.1)
  4     341946  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  5     297662  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  6     249793  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     248541  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     246950  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  9     226308  LISTSERV.ICORS.ORG (Windows Server 2008 R2 Datacenter x64 Edition)
 10     211384  LISTS.UFL.EDU (Linux 2.6.18)
 11     203112  LISTSERV.UMD.EDU (SunOS 5.10)
 12     191191  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     188769  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     182894  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 15     170268  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     167712  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17     163908  LISTS.UMN.EDU (Linux 2.6.32)
 18     162488  LISTSERV.UA.EDU (Linux 3.0.101)
 19     158581  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 20     155088  LIST.UVM.EDU (Linux 2.6.32)

Top 20 sites by number of subscribers (4 Aug 2017)

Pos Subscribers  Site
--- -----------  ----
  1     4912671  LISTS.PSU.EDU (AIX 6.1)
  2     4369006  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     1815811  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1575815  LISTS.WAYNE.EDU (Linux 2.6.18)
  5     1364468  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1313918  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     1304788  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1240962  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 10     1026642  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 11      988507  LIST.MSU.EDU (Linux 3.0.34)
 12      962004  LISTS.UMN.EDU (Linux 2.6.32)
 13      943692  LISTSERV.ND.EDU (Linux 2.6.18)
 14      938471  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 15      904626  LISTSERV.UA.EDU (Linux 3.0.101)
 16      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 17      789909  LISTSERV.UH.EDU (Linux 2.6.18)
 18      759099  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      753073  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      706505  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of lists (4 Aug 2017)

Pos Lists  Site
--- -----  ----
  1 32865  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 15199  LISTS.PSU.EDU (AIX 6.1)
  3 14017  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13450  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  7512  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  6845  MARIST (VM/SP 2.0)
  9  6656  LISTSERV.TAMU.EDU (Linux 3.0.101)
 10  6508  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11  6076  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 12  5721  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 13  5505  LISTS.UMN.EDU (Linux 2.6.32)
 14  4938  LISTSERV.UGA.EDU (Linux 2.6.32)
 15  4378  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4112  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 17  3992  LISTSERV.ND.EDU (Linux 2.6.18)
 18  3890  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3762  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3614  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (AUG17, 1-4)

Pos Recipients  Site
--- ----------  ----
  1     778779  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     361908  LISTS.PSU.EDU (AIX 6.1)
  3     291966  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  4     247044  LISTSERV.TAMU.EDU (Linux 3.0.101)
  5     246810  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     246718  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  7     222159  LISTSERV.ICORS.ORG (Windows Server 2008 R2 Datacenter x64 Edition)
  8     209039  LISTS.UFL.EDU (Linux 2.6.18)
  9     186426  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     182841  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11     180301  LISTSERV.UMD.EDU (SunOS 5.10)
 12     167504  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 13     166794  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     164254  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15     160317  LISTS.UMN.EDU (Linux 2.6.32)
 16     157031  LISTSERV.UA.EDU (Linux 3.0.101)
 17     152965  LIST.UVM.EDU (Linux 2.6.32)
 18     150027  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 19     135173  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 20     134840  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)

Top 20 lists by number of subscribers (4 Aug 2017)

Pos Subscribers  Site
--- -----------  ----
  1      300671  COMPUTING@LIST.MSU.EDU (Linux 3.0.34)
  2       62510  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       55891  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  4       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (AIX 5.3)
  5       41738  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  6       38329  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7       34918  ASMSU@LIST.MSU.EDU (Linux 3.0.34)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       34079  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 2.6.18)
 10       33616  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 11       30848  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.18)
 12       29030  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 13       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 14       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 15       28356  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 16       27713  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17       27534  TAU-BOGRIM@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 18       27418  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 19       26421  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 20       26101  CSTORE@LIST.MSU.EDU (Linux 3.0.34)