[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 29 October 2020


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 (OCT20, 1-29)

Pos Recipients  Site
--- ----------  ----
  1     810667  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     515730  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     429821  LISTS.PSU.EDU (AIX 6.1)
  4     409780  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  5     299477  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     258096  LISTES.ULAVAL.CA (Linux 3.10.0)
  7     253478  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  8     240466  LISTSERV.UGA.EDU (Linux 2.6.32)
  9     224592  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 10     207385  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 11     206437  LISTS.HAWAII.EDU (Linux 2.6.32-754.35.1.el6.x86_64)
 12     206308  LISTS.UFL.EDU (Linux 2.6.32)
 13     198945  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1127.18.2.el7.x86_64)
 14     198554  LIST.UNM.EDU (Linux 2.6.32-754.30.2.el6.x86_64)
 15     197491  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 16     188367  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 17     186680  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 18     179855  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 19     169312  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 20     155600  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)

Top 20 sites by number of subscribers (29 Oct 2020)

Pos Subscribers  Site
--- -----------  ----
  1     5188324  LISTES.ULAVAL.CA (Linux 3.10.0)
  2     4847976  LISTS.PSU.EDU (AIX 6.1)
  3     2212283  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1520280  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1400835  LISTSERV.UGA.EDU (Linux 2.6.32)
  6     1323690  LISTS.WAYNE.EDU (Linux 2.6.32)
  7     1217494  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  8     1193329  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1136183  LIST.MSU.EDU (Linux 3.10.0)
 10     1133298  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 12      962070  LISTS.UMN.EDU (Linux 3.10.0)
 13      923634  LISTSERV.UA.EDU (Linux 4.12.14)
 14      921167  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      847619  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 16      846155  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 17      842304  LISTSERV.UH.EDU (Linux 3.10.0)
 18      840297  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      806244  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      751436  LISTS.MAINE.EDU (Linux 3.10.0)

Top 20 sites by number of lists (29 Oct 2020)

Pos Lists  Site
--- -----  ----
  1 34750  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16569  LISTS.PSU.EDU (AIX 6.1)
  3 11361  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  5  9599  LISTS.UFL.EDU (Linux 2.6.32)
  6  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  7  7460  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8  6735  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
  9  5714  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10  5482  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 11  5187  LS.KULEUVEN.BE (Linux 2.6.32)
 12  5024  LISTSERV.TAMU.EDU (Linux 3.0.101)
 13  4911  LISTS.UMN.EDU (Linux 3.10.0)
 14  4818  LISTSERV.UGA.EDU (Linux 2.6.32)
 15  4213  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4170  LISTS.QUEENSU.CA (Linux 3.10.0)
 17  4133  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 18  3842  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 19  3729  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 20  3330  LISTSERV.BROWN.EDU (Linux 3.10.0)

Top 20 sites by volume generated daily (OCT20, 1-29)

Pos Recipients  Site
--- ----------  ----
  1     779682  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     515170  LISTSERV.TAMU.EDU (Linux 3.0.101)
  3     426680  LISTS.PSU.EDU (AIX 6.1)
  4     409267  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
  5     290774  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  6     257909  LISTES.ULAVAL.CA (Linux 3.10.0)
  7     235323  LISTSERV.UGA.EDU (Linux 2.6.32)
  8     222245  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
  9     205802  LISTS.HAWAII.EDU (Linux 2.6.32-754.35.1.el6.x86_64)
 10     204418  LISTS.UFL.EDU (Linux 2.6.32)
 11     202887  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 12     198743  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1127.18.2.el7.x86_64)
 13     198348  LIST.UNM.EDU (Linux 2.6.32-754.30.2.el6.x86_64)
 14     185920  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 15     184289  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16     179648  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 17     174804  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18     161467  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 19     152638  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 20     143569  L.GOP.COM (Windows Server 2016 Standard x64 Edition)

Top 20 lists by number of subscribers (29 Oct 2020)

Pos Subscribers  Site
--- -----------  ----
  1       59299  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  2       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  3       43010  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4       41803  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  5       36431  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  6       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  7       33596  L-SMEAL-REPORT@LISTS.PSU.EDU (AIX 6.1)
  8       30835  FOCIS_GROUP@LISTS.WAYNE.EDU (Linux 2.6.32)
  9       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 10       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 11       28309  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 12       27708  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 13       27478  TAU4U@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 14       27442  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 15       27390  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 16       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       25574  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 18       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 19       24322  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20       23332  ECF-MIWD@NYED.USCOURTS.GOV (Linux 3.10.0)