[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 16 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, 1-16)

Pos Recipients  Site
--- ----------  ----
  1     646429  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     212335  LISTS.PSU.EDU (AIX 6.1)
  3     185710  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  4     185287  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  5     174687  LISTSERV.TAMU.EDU (Linux 3.0.101)
  6     167554  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     161096  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  8     152570  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  9     149217  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 10     143476  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 11     135942  LISTSERV.UGA.EDU (Linux 2.6.32)
 12     134551  LISTSERV.UA.EDU (Linux 3.0.101)
 13     126251  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 14     122963  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 15     117817  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 16     115630  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17     113157  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 18     107008  LISTS.UFL.EDU (Linux 2.6.18)
 19     101127  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20      99072  LIST.UVM.EDU (Linux 2.6.32)

Top 20 sites by number of subscribers (16 Jul 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5253062  LISTS.PSU.EDU (AIX 6.1)
  2     3541216  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2076406  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1560544  LISTS.WAYNE.EDU (Linux 2.6.32)
  5     1424247  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1386192  LISTSERV.TAMU.EDU (Linux 3.0.101)
  7     1364602  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  8     1323310  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     1028948  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 12     1003783  LISTS.UMN.EDU (Linux 2.6.32)
 13      944029  LIST.MSU.EDU (Linux 3.10.0)
 14      883294  LISTSERV.UH.EDU (Linux 3.10.0)
 15      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 16      798183  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      780666  LISTSERV.UA.EDU (Linux 3.0.101)
 18      742210  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      682644  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      682162  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of lists (16 Jul 2018)

Pos Lists  Site
--- -----  ----
  1 27317  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16726  LISTS.PSU.EDU (AIX 6.1)
  3 14137  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13683  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  8072  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  9  7351  MARIST (VM/SP 2.0)
 10  6842  LISTSERV.TAMU.EDU (Linux 3.0.101)
 11  6593  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 12  6499  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 13  5720  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 14  5505  LISTS.UMN.EDU (Linux 2.6.32)
 15  5390  LISTSERV.UGA.EDU (Linux 2.6.32)
 16  4430  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 18  4273  LS.KULEUVEN.BE (Linux 2.6.32)
 19  3854  LISTS.QUEENSU.CA (Solaris 2.10)
 20  3822  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)

Top 20 sites by volume generated daily (JUL18, 1-16)

Pos Recipients  Site
--- ----------  ----
  1     620783  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     207624  LISTS.PSU.EDU (AIX 6.1)
  3     182803  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  4     176372  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  5     173824  LISTSERV.TAMU.EDU (Linux 3.0.101)
  6     163313  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     148744  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  8     140865  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  9     132266  LISTSERV.UGA.EDU (Linux 2.6.32)
 10     129948  LISTSERV.UA.EDU (Linux 3.0.101)
 11     121865  LISTS.HAWAII.EDU (Linux 2.6.32-696.20.1.el6.x86_64)
 12     121360  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 13     115246  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 14     112942  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 15     105207  LISTS.UFL.EDU (Linux 2.6.18)
 16     101094  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17      97366  LIST.UVM.EDU (Linux 2.6.32)
 18      92043  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      91105  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20      90938  LISTS.UMN.EDU (Linux 2.6.32)

Top 20 lists by number of subscribers (16 Jul 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62420  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41761  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       38709  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       36717  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       28880  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 14       28336  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       24866  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)