[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 28 June 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 (JUN17, 1-28)

Pos Recipients  Site
--- ----------  ----
  1     753379  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     373940  LSERV.CARDSYS.AT (Linux 4.4.59-1-pve)
  3     271659  LISTS.PSU.EDU (AIX 6.1)
  4     265283  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  5     227659  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     219571  LISTSERV.ACM.ORG (Windows Server 2008 R2 Datacenter x64 Edition)
  7     200709  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  8     192236  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  9     187841  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10     184182  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11     169342  H-NET.MSU.EDU (Linux 2.6.32)
 12     165722  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 13     160802  LISTSERV.ICORS.ORG (Windows Server 2008 R2 Datacenter x64 Edition)
 14     150731  LISTSERV.UGA.EDU (Linux 2.6.32)
 15     148178  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     147149  LIST.ETSI.ORG (Windows Server 2008 R2 Standard x64 Edition)
 17     128112  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 18     124689  LISTS.UFL.EDU (Linux 2.6.18)
 19     121999  LISTSERV.AAP.ORG (Windows Server 2003 R2 + LSMTP V1.1b)
 20     119412  LISTSERV.UA.EDU (Linux 3.0.101)

Top 20 sites by number of subscribers (28 Jun 2017)

Pos Subscribers  Site
--- -----------  ----
  1     4991875  LISTS.PSU.EDU (AIX 6.1)
  2     3534477  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     1805899  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1449897  LISTS.WAYNE.EDU (Linux 2.6.18)
  5     1336944  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  6     1326866  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     1290511  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1266737  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 10     1028744  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 11      990283  LIST.MSU.EDU (Linux 3.0.34)
 12      944785  LISTS.UMN.EDU (Linux 2.6.32)
 13      940975  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 14      940240  LISTSERV.ND.EDU (Linux 2.6.18)
 15      900165  LISTSERV.UA.EDU (Linux 3.0.101)
 16      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 17      770702  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      761415  LISTSERV.UH.EDU (Linux 2.6.18)
 19      741112  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      706775  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of lists (28 Jun 2017)

Pos Lists  Site
--- -----  ----
  1 26777  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 19474  LISTS.PSU.EDU (AIX 6.1)
  3 14020  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13292  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  6845  MARIST (VM/SP 2.0)
  8  6654  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9  6491  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 10  6381  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
 11  5940  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 12  5720  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 13  5472  LISTS.UMN.EDU (Linux 2.6.32)
 14  4889  LISTSERV.UGA.EDU (Linux 2.6.32)
 15  4374  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4074  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 17  3992  LISTSERV.ND.EDU (Linux 2.6.18)
 18  3869  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3726  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3590  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (JUN17, 1-28)

Pos Recipients  Site
--- ----------  ----
  1     726721  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     266674  LISTS.PSU.EDU (AIX 6.1)
  3     217653  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     195597  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  5     188943  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  6     185323  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  7     183013  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     167496  H-NET.MSU.EDU (Linux 2.6.32)
  9     165547  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
 10     156899  LISTSERV.ICORS.ORG (Windows Server 2008 R2 Datacenter x64 Edition)
 11     146580  LIST.ETSI.ORG (Windows Server 2008 R2 Standard x64 Edition)
 12     146335  LISTSERV.UGA.EDU (Linux 2.6.32)
 13     128757  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     127779  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 15     122922  LISTS.UFL.EDU (Linux 2.6.18)
 16     121248  LISTSERV.AAP.ORG (Windows Server 2003 R2 + LSMTP V1.1b)
 17     117764  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 18     115040  LIST.UVM.EDU (Linux 2.6.32)
 19     114098  LISTSERV.UA.EDU (Linux 3.0.101)
 20     107794  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 lists by number of subscribers (28 Jun 2017)

Pos Subscribers  Site
--- -----------  ----
  1      300681  COMPUTING@LIST.MSU.EDU (Linux 3.0.34)
  2       62523  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       55994  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  4       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (AIX 5.3)
  5       41702  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  6       34921  ASMSU@LIST.MSU.EDU (Linux 3.0.34)
  7       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  8       34081  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 2.6.18)
  9       33618  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
 10       31307  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11       30848  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.18)
 12       28924  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 13       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 14       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 15       28360  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 16       27713  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17       27418  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 18       26994  L-FACSTAFF-NEWSWIRE-UP@LISTS.PSU.EDU (AIX 6.1)
 19       26420  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 20       26103  CSTORE@LIST.MSU.EDU (Linux 3.0.34)