[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 22 September 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 (SEP18, 1-22)

Pos Recipients  Site
--- ----------  ----
  1     776329  LISTSERV.TAMU.EDU (Linux 3.0.101)
  2     685458  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  3     487996  LISTS.PSU.EDU (AIX 6.1)
  4     260240  LISTES.ULAVAL.CA (Linux 2.6.18)
  5     242064  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  6     240576  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  7     238752  LISTS.HAWAII.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
  8     228610  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  9     224058  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 10     220465  LISTSERV.UGA.EDU (Linux 2.6.32)
 11     213966  LISTS.UFL.EDU (Linux 2.6.18)
 12     210546  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 13     198340  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 14     197312  LIST.UNM.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 15     186828  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 16     183931  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 17     163914  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 18     155557  LISTS.UMN.EDU (Linux 2.6.32)
 19     148301  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 20     145016  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of subscribers (22 Sep 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5319877  LISTS.PSU.EDU (AIX 6.1)
  2     3675336  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2009852  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1378575  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5     1301463  LISTSERV.TAMU.EDU (Linux 3.0.101)
  6     1286146  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
  8     1180269  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  9     1149638  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11      986033  LISTS.UMN.EDU (Linux 2.6.32)
 12      944029  LIST.MSU.EDU (Linux 3.10.0)
 13      851343  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 14      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 15      815425  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16      777735  LISTSERV.UA.EDU (Linux 3.0.101)
 17      769481  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      767652  LISTSERV.UH.EDU (Linux 3.10.0)
 19      764556  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      735655  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of lists (22 Sep 2018)

Pos Lists  Site
--- -----  ----
  1 27115  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16890  LISTS.PSU.EDU (AIX 6.1)
  3 14192  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  5  9599  LISTS.UFL.EDU (Linux 2.6.18)
  6  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  7  7489  MARIST (VM/SP 2.0)
  8  6838  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  9  6610  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 10  6555  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 11  5532  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5522  LISTS.UMN.EDU (Linux 2.6.32)
 13  5108  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4450  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 16  4324  LS.KULEUVEN.BE (Linux 2.6.32)
 17  3936  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 18  3905  LISTS.QUEENSU.CA (Solaris 2.10)
 19  3843  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3672  YORKU.CA (Linux 2.6.32)

Top 20 sites by volume generated daily (SEP18, 1-22)

Pos Recipients  Site
--- ----------  ----
  1     774909  LISTSERV.TAMU.EDU (Linux 3.0.101)
  2     657790  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  3     483162  LISTS.PSU.EDU (AIX 6.1)
  4     260102  LISTES.ULAVAL.CA (Linux 2.6.18)
  5     238199  LISTS.HAWAII.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
  6     237573  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     216681  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8     215780  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     212284  LISTS.UFL.EDU (Linux 2.6.18)
 10     210498  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11     197133  LIST.UNM.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 12     195835  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 13     188711  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     186649  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 15     181566  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 16     152729  LISTS.UMN.EDU (Linux 2.6.32)
 17     147984  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 18     141992  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 19     141596  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20     140058  LIST.UVM.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (22 Sep 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62399  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41762  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       40647  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6       35700  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33606  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  9       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 10       29260  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
 11       29154  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       28323  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       25133  CANVASSTUDENTS_AUTO@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)