[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 24 May 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 (MAY18, 1-24)

Pos Recipients  Site
--- ----------  ----
  1     841727  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     324383  LISTS.PSU.EDU (AIX 6.1)
  3     315417  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     286080  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition + LSMTP V1.1b)
  5     275341  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  6     267367  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  7     242142  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  8     222107  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  9     216007  LSERV.CARDSYS.AT (Linux 4.4.98-6-pve)
 10     211997  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 11     207222  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 12     202546  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 13     197667  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14     188524  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 15     182970  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16     169954  LISTSERV.UGA.EDU (Linux 2.6.32)
 17     166245  LISTSERV.UA.EDU (Linux 3.0.101)
 18     158303  LISTSERV.UMD.EDU (SunOS 5.10)
 19     153745  LISTS.UFL.EDU (Linux 2.6.18)
 20     150049  LISTES.ULAVAL.CA (Linux 2.6.18)

Top 20 sites by number of subscribers (24 May 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5269927  LISTS.PSU.EDU (AIX 6.1)
  2     3572696  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2045836  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1531427  LISTS.WAYNE.EDU (Linux 2.6.32)
  5     1425965  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1357571  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  7     1356961  LISTSERV.UGA.EDU (Linux 2.6.32)
  8     1336788  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1027664  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12     1005566  LISTS.UMN.EDU (Linux 2.6.32)
 13      944029  LIST.MSU.EDU (Linux 3.10.0)
 14      874333  LISTSERV.UH.EDU (Linux 3.10.0)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      762062  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      761570  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      734017  LISTSERV.UA.EDU (Linux 3.0.101)
 19      693695  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20      693050  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of lists (24 May 2018)

Pos Lists  Site
--- -----  ----
  1 27122  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16074  LISTS.PSU.EDU (AIX 6.1)
  3 14117  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13518  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  8173  LISTSERV.UH.EDU (Linux 3.10.0)
  8  8043  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  7220  MARIST (VM/SP 2.0)
 10  6841  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11  6609  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12  6488  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 13  5721  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 14  5497  LISTS.UMN.EDU (Linux 2.6.32)
 15  5360  LISTSERV.UGA.EDU (Linux 2.6.32)
 16  4426  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 18  4225  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3897  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3799  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (MAY18, 1-24)

Pos Recipients  Site
--- ----------  ----
  1     811935  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     319272  LISTS.PSU.EDU (AIX 6.1)
  3     301603  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     285235  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition + LSMTP V1.1b)
  5     271159  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  6     236294  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  7     218647  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  8     206981  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  9     196318  LISTSERV.TAMU.EDU (Linux 3.0.101)
 10     185467  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 11     182929  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12     166299  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     161762  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     161244  LISTSERV.UA.EDU (Linux 3.0.101)
 15     151229  LISTS.UFL.EDU (Linux 2.6.18)
 16     149919  LISTES.ULAVAL.CA (Linux 2.6.18)
 17     144101  LISTS.UMN.EDU (Linux 2.6.32)
 18     143693  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 19     140145  LISTSERV.UMD.EDU (SunOS 5.10)
 20     139810  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)

Top 20 lists by number of subscribers (24 May 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62427  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41759  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       38807  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       35719  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       33609  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  9       30836  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       28565  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 13       28335  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 14       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 15       27465  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 16       27408  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 18       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 19       24888  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 20       23329  ECF-EDNY@NYED.USCOURTS.GOV (Linux 2.6.32)