[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 20 February 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 (FEB18, 1-20)

Pos Recipients  Site
--- ----------  ----
  1     852594  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     720046  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     474762  LISTS.PSU.EDU (AIX 6.1)
  4     319109  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     272141  LSERV.CARDSYS.AT (Linux 4.4.98-5-pve)
  6     268135  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     264274  LISTES.ULAVAL.CA (Linux 2.6.18)
  8     262237  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  9     260333  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 10     256639  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11     251297  LISTSERV.UMD.EDU (SunOS 5.10)
 12     221046  LISTS.UFL.EDU (Linux 2.6.18)
 13     219633  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     209665  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 15     198667  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 16     197031  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
 17     195326  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 18     193539  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19     188816  LISTS.HAWAII.EDU (Linux 2.6.32-696.16.1.el6.x86_64)
 20     180795  LISTSERV.UA.EDU (Linux 3.0.101)

Top 20 sites by number of subscribers (20 Feb 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5287864  LISTS.PSU.EDU (AIX 6.1)
  2     3648200  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     1941521  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1585729  LISTS.WAYNE.EDU (Linux 2.6.32)
  5     1413993  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1348259  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     1348255  LISTSERV.UGA.EDU (Linux 2.6.32)
  8     1324540  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  9     1208481  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1042244  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12      997083  LISTS.UMN.EDU (Linux 2.6.32)
 13      944029  LIST.MSU.EDU (Linux 3.0.34)
 14      929612  LISTSERV.ND.EDU (Linux 2.6.18)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      812218  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      807031  LISTSERV.UH.EDU (Linux 2.6.18)
 18      777002  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19      766431  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      755231  LISTSERV.UA.EDU (Linux 3.0.101)

Top 20 sites by number of lists (20 Feb 2018)

Pos Lists  Site
--- -----  ----
  1 27006  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16827  LISTS.PSU.EDU (AIX 6.1)
  3 14047  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13296  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  7805  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  6994  MARIST (VM/SP 2.0)
  9  6812  LISTSERV.TAMU.EDU (Linux 3.0.101)
 10  6594  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11  6284  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 12  5715  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 13  5481  LISTS.UMN.EDU (Linux 2.6.32)
 14  5250  LISTSERV.UGA.EDU (Linux 2.6.32)
 15  4406  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4329  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 17  4095  LS.KULEUVEN.BE (Linux 2.6.32)
 18  3966  LISTSERV.ND.EDU (Linux 2.6.18)
 19  3879  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3752  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (FEB18, 1-20)

Pos Recipients  Site
--- ----------  ----
  1     821939  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     718650  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     470041  LISTS.PSU.EDU (AIX 6.1)
  4     304624  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     264097  LISTES.ULAVAL.CA (Linux 2.6.18)
  6     262056  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     255356  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  8     253652  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  9     228393  LISTSERV.UMD.EDU (SunOS 5.10)
 10     221319  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 11     218852  LISTS.UFL.EDU (Linux 2.6.18)
 12     214157  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 13     209480  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 14     193484  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 15     192248  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 16     188277  LISTS.HAWAII.EDU (Linux 2.6.32-696.16.1.el6.x86_64)
 17     175311  LISTSERV.UA.EDU (Linux 3.0.101)
 18     175116  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19     165953  LIST.UVM.EDU (Linux 2.6.32)
 20     159289  LISTS.UMN.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (20 Feb 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.0.34)
  2       62441  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41755  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       39119  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       38329  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7       35797  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       33611  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 10       30848  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 11       29003  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       28340  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27710  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27413  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       26419  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 18       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 19       23786  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 20       23329  ECF-EDNY@NYED.USCOURTS.GOV (Linux 2.6.32)