[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 18 January 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 (JAN19, 1-18)

Pos Recipients  Site
--- ----------  ----
  1     841182  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     454130  LISTS.PSU.EDU (AIX 6.1)
  3     421588  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     297527  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     254211  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  6     237423  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     234718  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8     234685  LISTES.ULAVAL.CA (Linux 3.10.0)
  9     215387  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 10     212564  LISTSERV.UMD.EDU (SunOS 5.10)
 11     211073  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 12     210001  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 13     208494  LISTS.UFL.EDU (Linux 2.6.32)
 14     193147  LISTS.HAWAII.EDU (Linux 2.6.32-754.9.1.el6.x86_64)
 15     186212  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     184866  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17     178167  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
 18     165561  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 19     143045  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 20     142101  LISTS.UMN.EDU (Linux 2.6.32)

Top 20 sites by number of subscribers (18 Jan 2019)

Pos Subscribers  Site
--- -----------  ----
  1     5275446  LISTS.PSU.EDU (AIX 6.1)
  2     3757504  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2130142  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1374994  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1367700  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1336290  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     1307597  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  9     1140219  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11      988890  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      810858  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      805402  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 16      794674  LISTSERV.UH.EDU (Linux 3.10.0)
 17      791103  LISTSERV.UA.EDU (Linux 3.0.101)
 18      779827  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19      769290  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      743949  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of lists (18 Jan 2019)

Pos Lists  Site
--- -----  ----
  1 26955  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16942  LISTS.PSU.EDU (AIX 6.1)
  3 14247  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 12302  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  7510  MARIST (VM/SP 2.0)
  9  6892  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6663  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11  5663  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5465  LISTS.UMN.EDU (Linux 2.6.32)
 13  5106  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4438  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4418  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 17  3974  LISTS.QUEENSU.CA (Solaris 2.10)
 18  3891  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19  3731  YORKU.CA (Linux 2.6.32)
 20  3614  LISTSERV.BUFFALO.EDU (Solaris 2.11)

Top 20 sites by volume generated daily (JAN19, 1-18)

Pos Recipients  Site
--- ----------  ----
  1     812831  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     449704  LISTS.PSU.EDU (AIX 6.1)
  3     420664  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     283835  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     251303  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  6     234688  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
  7     234490  LISTES.ULAVAL.CA (Linux 3.10.0)
  8     231854  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     212703  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 10     207278  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11     206798  LISTS.UFL.EDU (Linux 2.6.32)
 12     191541  LISTSERV.UMD.EDU (SunOS 5.10)
 13     190245  LISTS.HAWAII.EDU (Linux 2.6.32-754.9.1.el6.x86_64)
 14     183044  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15     161153  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 16     152681  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17     142778  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 18     139661  LISTS.UMN.EDU (Linux 2.6.32)
 19     135260  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20     132814  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)

Top 20 lists by number of subscribers (18 Jan 2019)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62363  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       62011  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  4       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  5       44129  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.4.162)
  7       39267  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       33603  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 10       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 11       29400  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       28318  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27402  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       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 20       24786  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)