[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 21 July 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 (JUL18, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     661020  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     279887  LISTS.PSU.EDU (AIX 6.1)
  3     190062  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     186727  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  5     183106  LISTSERV.TAMU.EDU (Linux 3.0.101)
  6     182103  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  7     171478  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  8     169558  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  9     145358  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 10     141945  LISTSERV.UGA.EDU (Linux 2.6.32)
 11     130196  LISTSERV.UA.EDU (Linux 3.0.101)
 12     129141  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 13     128916  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 14     126554  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15     122006  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 16     120719  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 17     120413  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 18     112960  LISTS.UFL.EDU (Linux 2.6.18)
 19     110449  OCLCLISTS.ORG (Windows Server 2012 R2 Standard x64 Edition)
 20     105143  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of subscribers (21 Jul 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5271787  LISTS.PSU.EDU (AIX 6.1)
  2     3538355  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2093790  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1562687  LISTS.WAYNE.EDU (Linux 2.6.32)
  5     1376046  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1365114  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  7     1356630  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1354644  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1018638  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12     1005431  LISTS.UMN.EDU (Linux 2.6.32)
 13      944029  LIST.MSU.EDU (Linux 3.10.0)
 14      881721  LISTSERV.UH.EDU (Linux 3.10.0)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      798251  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      784254  LISTSERV.UA.EDU (Linux 3.0.101)
 18      739884  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      682625  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20      678608  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of lists (21 Jul 2018)

Pos Lists  Site
--- -----  ----
  1 27317  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16734  LISTS.PSU.EDU (AIX 6.1)
  3 14144  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13692  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  8187  LISTSERV.UH.EDU (Linux 3.10.0)
  8  8073  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  7404  MARIST (VM/SP 2.0)
 10  6846  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11  6595  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12  6499  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 13  5721  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 14  5509  LISTS.UMN.EDU (Linux 2.6.32)
 15  5391  LISTSERV.UGA.EDU (Linux 2.6.32)
 16  4431  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 18  4280  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3854  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3811  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (JUL18, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     635005  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     274802  LISTS.PSU.EDU (AIX 6.1)
  3     184252  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  4     182309  LISTSERV.TAMU.EDU (Linux 3.0.101)
  5     180332  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     165073  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     142827  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  8     138248  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     128484  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 10     125444  LISTSERV.UA.EDU (Linux 3.0.101)
 11     121719  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 12     121150  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 13     120190  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 14     118090  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 15     111019  LISTS.UFL.EDU (Linux 2.6.18)
 16     105111  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17     102924  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18     100744  LIST.UVM.EDU (Linux 2.6.32)
 19      98040  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20      97616  LISTS.UMN.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (21 Jul 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62416  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       38708  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       37876  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7       35712  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       33607  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 10       30836  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
 11       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 12       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 13       28870  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       28333  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27408  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       27079  HINDU-D@LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18       26417  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 19       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 20       24863  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)