[LISTSERV - the mailing list management classic]

LISTSERV Top 20 statistics – 15 August 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 (AUG18, 1-15)

Pos Recipients  Site
--- ----------  ----
  1     598080  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     271199  LISTS.PSU.EDU (AIX 6.1)
  3     222090  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  4     209902  DIGITAL.ANNEXBUSINESSMEDIA.COM (Linux 3.13.0-32-generic)
  5     209112  LISTSERV.TAMU.EDU (Linux 3.0.101)
  6     202467  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     192741  LISTSERV.ACM.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  8     190996  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  9     159307  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
 10     154469  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
 11     143337  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 12     142088  LISTSERV.TDBANK.CA (Windows Server 2012 R2 Datacenter x64 Edition)
 13     139629  LISTS.HAWAII.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 14     137755  LIST.UNM.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 15     137135  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 16     128600  LISTS.UFL.EDU (Linux 2.6.18)
 17     127889  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 18     124904  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19     121182  LIST.UVM.EDU (Linux 2.6.32)
 20     117190  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of subscribers (15 Aug 2018)

Pos Subscribers  Site
--- -----------  ----
  1     5300595  LISTS.PSU.EDU (AIX 6.1)
  2     4371265  LISTES.ULAVAL.CA (Linux 2.6.18)
  3     2103755  LS.KULEUVEN.BE (Linux 2.6.32)
  4     1416539  LISTSERV.TAU.AC.IL (Linux 2.6.9)
  5     1373413  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  6     1307895  LISTSERV.UGA.EDU (Linux 2.6.32)
  7     1282581  LISTSERV.UTORONTO.CA (Linux 2.6.18)
  8     1259529  LISTSERV.TAMU.EDU (Linux 3.0.101)
  9     1091626  LISTS.WAYNE.EDU (Linux 2.6.32)
 10     1059036  LISTS.UFL.EDU (Linux 2.6.18)
 11     1008779  LISTS.UMN.EDU (Linux 2.6.32)
 12      944029  LIST.MSU.EDU (Linux 3.10.0)
 13      823232  LISTSERV.BUFFALO.EDU (Solaris 2.11)
 14      818258  CUVMC.AIS.COLUMBIA.EDU (VM/SP 4.0)
 15      810070  LISTSERV.UH.EDU (Linux 3.10.0)
 16      805606  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 17      752537  LISTSERV.UA.EDU (Linux 3.0.101)
 18      752140  LISTSERV.ECU.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 19      736196  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20      709915  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 sites by number of lists (15 Aug 2018)

Pos Lists  Site
--- -----  ----
  1 33463  LISTES.ULAVAL.CA (Linux 2.6.18)
  2 16785  LISTS.PSU.EDU (AIX 6.1)
  3 14164  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  4 13727  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  8077  LISTSERV.TECHNION.AC.IL (Linux 2.6.32)
  8  7419  MARIST (VM/SP 2.0)
  9  6598  LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 10  6514  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 11  5507  LISTS.UMN.EDU (Linux 2.6.32)
 12  5433  LISTSERV.UGA.EDU (Linux 2.6.32)
 13  5066  LISTSERV.TAMU.EDU (Linux 3.0.101)
 14  4443  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15  4372  LISTSERV.UTORONTO.CA (Linux 2.6.18)
 16  4298  LS.KULEUVEN.BE (Linux 2.6.32)
 17  3925  LISTSERV.MILLERSVILLE.EDU (Linux 2.6.32)
 18  3876  LISTS.QUEENSU.CA (Solaris 2.10)
 19  3809  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20  3656  YORKU.CA (Linux 2.6.32)

Top 20 sites by volume generated daily (AUG18, 1-15)

Pos Recipients  Site
--- ----------  ----
  1     573128  JISCMAIL.AC.UK (Windows Server 2008 R2 Enterprise x64 Edition)
  2     266350  LISTS.PSU.EDU (AIX 6.1)
  3     221876  DISCUSSIONS.EQ.EDU.AU (Linux 2.6.18-404.el5)
  4     208168  LISTSERV.TAMU.EDU (Linux 3.0.101)
  5     197890  LISTSERV.UGA.EDU (Linux 2.6.32)
  6     187150  LISTSERV.BUFFALO.EDU (Solaris 2.11)
  7     155770  LISTSERV.ICORS.ORG (Windows Server 2012 R2 Datacenter x64 Edition)
  8     151625  LSV.UKY.EDU (Windows Server 2012 R2 Datacenter x64 Edition)
  9     139263  LISTS.HAWAII.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 10     137556  LIST.UNM.EDU (Linux 2.6.32-696.23.1.el6.x86_64)
 11     136072  LISTSERV.LIV.AC.UK (Linux 2.6.32)
 12     127636  LISTSERV.AAP.ORG (Windows Server 2012 R2 Standard x64 Edition)
 13     126603  LISTS.UFL.EDU (Linux 2.6.18)
 14     121335  LISTSERV.DARTMOUTH.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 15     119466  LIST.UVM.EDU (Linux 2.6.32)
 16     117149  LISTS.UCDENVER.EDU (Windows Server 2012 R2 Standard x64 Edition)
 17     114440  LISTSERV.SYR.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18     111763  LISTS.UMN.EDU (Linux 2.6.32)
 19     108234  LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 20     107404  LISTSERV.UCONN.EDU (Windows Server 2012 R2 Standard x64 Edition)

Top 20 lists by number of subscribers (15 Aug 2018)

Pos Subscribers  Site
--- -----------  ----
  1      300656  COMPUTING@LIST.MSU.EDU (Linux 3.10.0)
  2       62400  EXCEL@LISTSERV.UTA.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
  3       54050  AMIS-CNRS-INTERNATIONAL-L@IN2P3.FR (Linux 3.10.0)
  4       41763  OPSWNEWS@LISTSERV.NYSED.GOV (AIX 7.1)
  5       38269  CAREERCENTERUPDATE@LISTSERV.UGA.EDU (Linux 2.6.32)
  6       37876  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       29007  HALLCOLIBRARY-L@LISTSERV.UGA.EDU (Linux 2.6.32)
 12       28918  BEDRIJVENLIJST@LS.KULEUVEN.BE (Linux 2.6.32)
 13       28918  BEDRIJVENLIJST2@LS.KULEUVEN.BE (Linux 2.6.32)
 14       28331  L-THON-NEWS@LISTS.PSU.EDU (AIX 6.1)
 15       27709  RECREATION@LISTSERV.MIAMIOH.EDU (Windows Server 2012 R2 Standard x64 Edition)
 16       27405  VOLUPDATE@LISTSERV.UTK.EDU (Solaris 2.10)
 17       27079  HINDU-D@LISTSERV.NODAK.EDU (Windows Server 2008 R2 Enterprise x64 Edition)
 18       26418  PARENTS@LISTSERV.TAMU.EDU (Linux 3.0.101)
 19       24990  NCHPAD-NEWS@LISTSERV.UAB.EDU (Linux 2.6.32)
 20       24781  ISMA@LS.KULEUVEN.BE (Linux 2.6.32)