[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 21 January 2021


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 (JAN21, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     786183  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     351712  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  3     324593  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     275603  LISTS.PSU.EDU (AIX 6.1)
  5     230687  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     215396  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  7     214544  LISTSERV.UGA.EDU (Linux 2.6.32)
  8     191377  LISTS.HAWAII.EDU (Linux 2.6.32-754.35.1.el6.x86_64)
  9     190646  LISTS.UFL.EDU (Linux 2.6.32)
 10     178510  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 11     171411  LISTSERV.TDBANK.CA (Windows Server 2012 R2 Datacenter x64 Edition)
 12     167220  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 13     149560  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 14     144995  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 15     141881  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 16     138487  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17     125798  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 18     121288  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 19     121152  MASSMAIL.VCU.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 20     119268  LISTSERV.UTORONTO.CA (Linux 3.10.0)

Top 20 sites by number of subscribers (21 Jan 2021)

Pos Subscribers  Site
--- -----------  ----
  1     5188324  LISTES.ULAVAL.CA (Linux 3.10.0)
  2     4992881  LISTS.PSU.EDU (AIX 6.1)
  3     2288966  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1591585  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1442398  LISTSERV.UGA.EDU (Linux 2.6.32)
  6     1325170  LISTS.WAYNE.EDU (Linux 2.6.32)
  7     1217494  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  8     1193905  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1146397  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10     1127961  LIST.MSU.EDU (Linux 3.10.0)
 11     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 12      960501  LISTS.UMN.EDU (Linux 3.10.0)
 13      937033  LISTSERV.UA.EDU (Linux 4.12.14)
 14      926838  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15      852136  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16      829744  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 17      827828  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18      813625  LISTSERV.UH.EDU (Linux 3.10.0)
 19      809232  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 20      749922  LISTS.MAINE.EDU (Linux 3.10.0)

Top 20 sites by number of lists (21 Jan 2021)

Pos Lists  Site
--- -----  ----
  1 34750  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 17009  LISTS.PSU.EDU (AIX 6.1)
  3 11852  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  7523  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  8  6734  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
  9  5789  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 10  5482  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 11  5289  LS.KULEUVEN.BE (Linux 2.6.32)
 12  5023  LISTSERV.TAMU.EDU (Linux 3.0.101)
 13  4913  LISTS.UMN.EDU (Linux 3.10.0)
 14  4887  LISTSERV.UGA.EDU (Linux 2.6.32)
 15  4235  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16  4179  LISTS.QUEENSU.CA (Linux 3.10.0)
 17  3984  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 18  3723  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 19  3334  LIST.UVM.EDU (Linux 2.6.32)
 20  3319  LISTSERV.BROWN.EDU (Linux 3.10.0)

Top 20 sites by volume generated daily (JAN21, 1-21)

Pos Recipients  Site
--- ----------  ----
  1     756962  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     341515  LISTSERV.LIV.AC.UK (Linux 2.6.32)
  3     323926  LISTSERV.TAMU.EDU (Linux 3.0.101)
  4     272547  LISTS.PSU.EDU (AIX 6.1)
  5     230467  LISTES.ULAVAL.CA (Linux 3.10.0)
  6     209921  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     189481  LISTS.UFL.EDU (Linux 2.6.32)
  8     189187  LISTS.HAWAII.EDU (Linux 2.6.32-754.35.1.el6.x86_64)
  9     176326  LISTSERV.REDIRIS.ES (Linux 2.6.32-504.3.3.el6.x86_64)
 10     144756  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 11     141341  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 12     140089  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 13     138293  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)
 14     124041  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 15     117917  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 16     117778  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 17     117335  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 18     112269  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 19     111366  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20     110375  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)

Top 20 lists by number of subscribers (21 Jan 2021)

Pos Subscribers  Site
--- -----------  ----
  1       59276  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  2       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  3       43187  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4       41807  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  5       36015  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  6       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  7       33581  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       28304  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 12       27708  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 13       27479  TAU4U@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 14       27390  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 15       27206  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 16       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 17       25576  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)
 18       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 19       24316  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20       23332  ECF-MIWD@NYED.USCOURTS.GOV (Linux 3.10.0)