[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 21 March 2017


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 (MAR17, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     917259  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     434223  LISTS.PSU.EDU (AIX 6.1)
  3     369575  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     318205  LSERV.CARDSYS.AT (Linux 4.4.40-1-pve)
  5     309550  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  6     292610  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  7     285665  LSV.UKY.EDU (Windows Server 2003)
  8     252975  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
  9     249973  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     248997  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 11     220998  LISTES.ULAVAL.CA (Linux 2.6.18)
 12     212042  LISTS.UFL.EDU (Linux 2.6.18)
 13     204071  LISTSERV.UMD.EDU (SunOS 5.10)
 14     201787  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 15     193910  LISTS.HAWAII.EDU (Linux 2.6.32-642.6.2.el6.x86_64)
 16     191232  LISTSERV.ACM.ORG (Windows Server 2008 R2 Datacenter x64 Edition)
 17     189093  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
 18     181012  H-NET.MSU.EDU (Linux 2.6.32)
 19     173258  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     171116  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)

Top 20 sites by number of subscribers (21 Mar 2017)

Pos Subscribers  Site
--- -----------  ----
  1     4949111  LISTS.PSU.EDU (AIX 6.1)
  2     3649124  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     1783504  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1745906  LISTSERV.UGA.EDU (Linux 2.6.32)
  5     1457670  LISTS.WAYNE.EDU (Linux 2.6.18)
  6     1325424  LSV.UKY.EDU (Windows Server 2003)
  7     1272926  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  8     1233199  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1088692  LIST.MSU.EDU (Linux 3.0.34)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1056304  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12      997134  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 13      936920  LISTS.UMN.EDU (Linux 2.6.32)
 14      917879  LISTSERV.UA.EDU (Linux 3.0.82)
 15      913927  LISTSERV.ND.EDU (Linux 2.6.18)
 16      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 17      805269  LISTSERV.UH.EDU (Linux 2.6.18)
 18      783996  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 19      779738  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      756574  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by number of lists (21 Mar 2017)

Pos Lists  Site
--- -----  ----
  1 26792  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 19132  LISTS.PSU.EDU (AIX 6.1)
  3 14108  LSV.UKY.EDU (Windows Server 2003)
  4 12295  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  7512  LISTSERV.UGA.EDU (Linux 2.6.32)
  8  7401  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  6845  MARIST (VM/SP 2.0)
 10  6598  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11  6476  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12  5867  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 13  5719  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 14  5468  LISTS.UMN.EDU (Linux 2.6.32)
 15  4333  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4007  LISTSERV.ND.EDU (Linux 2.6.18)
 17  3879  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 18  3828  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3706  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3556  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (MAR17, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     888876  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     428601  LISTS.PSU.EDU (AIX 6.1)
  3     368121  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     305226  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  5     282662  LSV.UKY.EDU (Windows Server 2003)
  6     280925  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  7     252540  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
  8     244000  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     220723  LISTES.ULAVAL.CA (Linux 2.6.18)
 10     210268  LISTS.UFL.EDU (Linux 2.6.18)
 11     203312  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 12     201598  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 13     192486  LISTS.HAWAII.EDU (Linux 2.6.32-642.6.2.el6.x86_64)
 14     183719  LISTSERV.UMD.EDU (SunOS 5.10)
 15     179109  H-NET.MSU.EDU (Linux 2.6.32)
 16     173200  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17     167816  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 18     166638  LIST.UVM.EDU (Linux 2.6.32)
 19     159010  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20     157593  LISTS.UMN.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (21 Mar 2017)

Pos Subscribers  Site
--- -----------  ----
  1      300691  COMPUTING@LIST.MSU.EDU (Linux 3.0.34)
  2       62532  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       56335  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  4       54051  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (AIX 5.3)
  5       41589  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  6       37436  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7       34925  ASMSU@LIST.MSU.EDU (Linux 3.0.34)
  8       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  9       34097  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 2.6.18)
 10       33619  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 11       30848  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.18)
 12       29715  L-FACSTAFF-NEWSWIRE-UP@LISTS.PSU.EDU (AIX 6.1)
 13       28931  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 15       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 16       28365  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 17       27715  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 18       27418  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 19       26419  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 20       26106  CSTORE@LIST.MSU.EDU (Linux 3.0.34)