[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 9 July 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 (JUL19, 1-9)

Pos Recipients  Site
--- ----------  ----
  1     697556  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     224227  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  3     206716  LISTS.PSU.EDU (AIX 6.1)
  4     191520  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     183385  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  6     168829  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     147323  LISTSERV.TDBANK.CA (Windows Server 2012 R2 Datacenter x64 Edition)
  8     138217  LISTSERV.UA.EDU (Linux 3.0.101)
  9     137276  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 10     129576  LISTS.UFL.EDU (Linux 2.6.32)
 11     125585  LISTSERV.UGA.EDU (Linux 2.6.32)
 12     117771  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 13     116155  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     111244  LIST.UVM.EDU (Linux 2.6.32)
 15     106653  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     100935  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 17      99892  OCLCLISTS.ORG (Windows Server 2012 R2 Standard x64 Edition)
 18      99569  LISTS.UMN.EDU (Linux 2.6.32)
 19      97046  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 20      94816  LISTS.VATRAFFIC.ORG (Windows Server 2012 R2 Datacenter x64 Edition)

Top 20 sites by number of subscribers (9 Jul 2019)

Pos Subscribers  Site
--- -----------  ----
  1     5044143  LISTS.PSU.EDU (AIX 6.1)
  2     3671776  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     2154659  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1456303  LISTSERV.UGA.EDU (Linux 2.6.32)
  5     1454401  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1416633  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  7     1300281  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1282581  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  9     1132924  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 11      982099  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      801598  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 15      799895  LISTSERV.UA.EDU (Linux 3.0.101)
 16      789705  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      754134  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      749307  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19      745493  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      717435  LISTSERV.UH.EDU (Linux 3.10.0)

Top 20 sites by number of lists (9 Jul 2019)

Pos Lists  Site
--- -----  ----
  1 27472  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16804  LISTS.PSU.EDU (AIX 6.1)
  3 14352  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13994  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  7598  MARIST (VM/SP 2.0)
  9  7056  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 10  6678  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 11  5873  LISTSERV.UGA.EDU (Linux 2.6.32)
 12  5467  LISTS.UMN.EDU (Linux 2.6.32)
 13  5079  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4594  LS.KULEUVEN.BE (Linux 2.6.32)
 15  4432  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4372  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 17  3998  LISTS.QUEENSU.CA (Solaris 2.10)
 18  3982  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3936  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3474  LISTSERV.BUFFALO.EDU (Solaris 2.11)

Top 20 sites by volume generated daily (JUL19, 1-9)

Pos Recipients  Site
--- ----------  ----
  1     669530  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     221536  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  3     202700  LISTS.PSU.EDU (AIX 6.1)
  4     184951  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     167659  LISTSERV.TAMU.EDU (Linux 3.0.101)
  6     133120  LISTSERV.UA.EDU (Linux 3.0.101)
  7     128389  LISTS.UFL.EDU (Linux 2.6.32)
  8     122031  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     115165  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10     113020  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 11     109352  LIST.UVM.EDU (Linux 2.6.32)
 12      99175  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 13      96563  LISTS.UMN.EDU (Linux 2.6.32)
 14      94816  LISTS.VATRAFFIC.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 15      93699  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 16      91644  LISTS.HAWAII.EDU (Linux 2.6.32-754.14.2.el6.x86_64)
 17      88701  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      87762  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19      87515  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 20      84546  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)

Top 20 lists by number of subscribers (9 Jul 2019)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       61633  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       46503  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  5       41763  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.4.162)
  6       36548  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33602  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  9       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 10       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 11       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 12       28377  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 13       28316  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 14       27710  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 15       27401  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 16       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       25008  2019-STEM-EVENT-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)
 18       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 19       24765  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 20       24496  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)