[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 14 November 2022


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 (NOV22, 1-14)

Pos Recipients  Site
--- ----------  ----
  1     780538  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     379267  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  3     363511  LISTS.PSU.EDU (Linux 3.10.0)
  4     267124  LISTES.ULAVAL.CA (Linux 3.10.0)
  5     230271  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.59.1.el7.x86_64)
  6     215635  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
  7     202934  LISTSERV.ACM.ORG (Windows Server 2016 Datacenter x64 Edition)
  8     197382  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  9     178908  LISTS.HAWAII.EDU (Linux 3.10.0-1160.76.1.el7.x86_64)
 10     177975  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
 11     176477  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 12     166736  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 13     158708  LISTS.UFL.EDU (Linux 2.6.32)
 14     151221  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 15     147608  LISTSERV.TDBANK.CA (Windows Server 2016 Datacenter x64 Edition)
 16     135166  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 17     129902  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 18     115815  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 19     113742  NASLISTS.NORIDIAN.COM (Windows Server 2019 Standard x64 Edition)
 20     110894  LISTSERV.WUSTL.EDU (Windows Server 2016 Standard x64 Edition)

Top 20 sites by number of subscribers (14 Nov 2022)

Pos Subscribers  Site
--- -----------  ----
  1     5251966  LISTS.PSU.EDU (Linux 3.10.0)
  2     5000408  LISTES.ULAVAL.CA (Linux 3.10.0)
  3     1943235  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  4     1777535  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1613852  LISTSERV.UTORONTO.CA (Linux 3.10.0)
  6     1252000  LISTSERV.UA.EDU (Linux 4.12.14)
  7     1108174  LISTSERV.TAMU.EDU (Linux 3.0.101)
  8     1102510  LISTS.WAYNE.EDU (Linux 2.6.32)
  9     1078709  LISTSERV.UH.EDU (Linux 3.10.0)
 10     1065720  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 11     1059036  LISTS.UFL.EDU (Linux 2.6.32)
 12      947826  LIST.MSU.EDU (Linux 3.10.0)
 13      934201  LISTS.UMN.EDU (Linux 3.10.0)
 14      907652  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 15      853488  LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16      847431  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 17      780902  LISTSERV.ECU.EDU (Windows Server 2016 Standard x64 Edition)
 18      740052  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 19      723834  LISTSERV.LIV.AC.UK (Linux 3.10.0)
 20      704944  LISTS.QUEENSU.CA (Linux 3.10.0)

Top 20 sites by number of lists (14 Nov 2022)

Pos Lists  Site
--- -----  ----
  1 28441  LISTES.ULAVAL.CA (Linux 3.10.0)
  2 16793  LISTS.PSU.EDU (Linux 3.10.0)
  3 14174  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  4 10884  LISTSERV.UH.EDU (Linux 3.10.0)
  5  9788  LISTS.CLEMSON.EDU (Linux 2.6.18)
  6  9599  LISTS.UFL.EDU (Linux 2.6.32)
  7  8079  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  7217  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  9  6788  LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 10  6490  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 11  5454  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 12  4973  LISTSERV.TAMU.EDU (Linux 3.0.101)
 13  4832  LISTS.UMN.EDU (Linux 3.10.0)
 14  4519  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 15  4374  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 16  3911  LISTS.QUEENSU.CA (Linux 3.10.0)
 17  3830  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 18  3554  LIST.UVM.EDU (Linux 2.6.32)
 19  3542  LISTSERV.BROWN.EDU (Linux 3.10.0)
 20  3334  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)

Top 20 sites by volume generated daily (NOV22, 1-14)

Pos Recipients  Site
--- ----------  ----
  1     746568  JISCMAIL.AC.UK (Windows Server 2019 Standard x64 Edition)
  2     370751  LISTSERV.LIV.AC.UK (Linux 3.10.0)
  3     360251  LISTS.PSU.EDU (Linux 3.10.0)
  4     267012  LISTES.ULAVAL.CA (Linux 3.10.0)
  5     230039  DISCUSSIONS.EQ.EDU.AU (Linux 3.10.0-1160.59.1.el7.x86_64)
  6     191934  LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  7     178543  LISTS.HAWAII.EDU (Linux 3.10.0-1160.76.1.el7.x86_64)
  8     177724  LISTSERV.UIC.EDU (Linux 2.6.32-504.8.1.el6.x86_64)
  9     176207  LISTSERV.UCONN.EDU (Windows Server 2019 Datacenter x64 Edition)
 10     163579  LISTSERV.NODAK.EDU (Windows Server 2019 Standard x64 Edition)
 11     157443  LISTS.UFL.EDU (Linux 2.6.32)
 12     156006  LISTSERV.SYR.EDU (Windows Server 2019 Standard x64 Edition)
 13     149175  LISTSERV.DARTMOUTH.EDU (Windows Server 2016 Datacenter x64 Edition)
 14     130940  LISTSERV.BUFFALO.EDU (Linux 3.10.0)
 15     127726  LSV.UKY.EDU (Windows Server 2019 Datacenter x64 Edition)
 16     115523  LIST.ETSI.ORG (Windows Server 2016 Datacenter x64 Edition)
 17     110087  LISTSERV.UTORONTO.CA (Linux 3.10.0)
 18     107621  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 19     107496  LISTSERV.KENT.EDU (Windows Server 2012 R2 Standard x64 Edition)
 20      99081  LIST.MSU.EDU (Linux 3.10.0)

Top 20 lists by number of subscribers (14 Nov 2022)

Pos Subscribers  Site
--- -----------  ----
  1       42828  SAFETYNOTICE@LISTSERV.UC.EDU (Windows Server 2019 Datacenter x64 Edition)
  2       41827  OPSWNEWS@LISTSERV.NYSED.GOV (Linux 4.12.14)
  3       40481  SUCCESS@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  4       34587  TCUATHLETICSDIRECTOR@LISTSERV.TCU.EDU (Windows Server 2012 R2 Standard x64 Edition)
  5       33091  CMU-BASKETBALL@LS2.CMICH.EDU (Linux 3.10.0)
  6       31621  TAU-STU-ACADEMICSEC-STUDENTS@LISTSERV.TAU.AC.IL (Linux 2.6.9)
  7       30181  UG2021FALL@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  8       29105  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
  9       28887  TAU-INNOVTL-ALL-STUDENTS@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 10       28259  L-THON-NEWS@LISTS.PSU.EDU (Linux 3.10.0)
 11       27705  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2016 Standard x64 Edition)
 12       27479  TAU4U@LISTSERV.TAU.AC.IL (Linux 2.6.9)
 13       27374  VOLUPDATE@LISTSERV.UTK.EDU (Linux 3.10.0)
 14       27347  UTENNSRP@LISTSERV.UTK.EDU (Linux 3.10.0)
 15       26421  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 16       25619  ECF-MIWD@NYED.USCOURTS.GOV (Linux 3.10.0)
 17       24992  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 3.10.0)
 18       24288  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19       23347  DSSAT@LISTSERV.UGA.EDU (Windows Server 2016 Datacenter x64 Edition)
 20       22769  STUDENT-TRAVEL-SURVEY-L@LISTSERV.OKSTATE.EDU (Windows Server 2012 Datacenter x64 Edition)