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+
+NWG/RFC 751                                          PDL 10 Dec 78 nnnnn
+
+
+
+
+
+Network Working Group                                   P. David Lebling
+Request for Comments: 751                                  (PDL@MIT-DMS)
+NIC: nnnnn                                              10 December 1978
+
+
+
+                      SURVEY OF FTP MAIL AND MLFL
+
+
+
+
+Two surveys of Arpanet Server hosts were run between September 20, 1978
+and December 11, 1978.  The intent was to determine the response of the
+host's Server FTP program to:
+
+(a) An attempt to mail to an unknown recipient at that host.  The
+purpose of this survey was two-fold.  First, to determine whether the
+host accepts mail for unknown recipients at all, and second, what
+response the host gives if it does not accept such mail.
+
+(b) An attempt to mail to a known recipient using the MLFL command
+rather than the usual MAIL command.  This survey was undertaken to
+determine the extent of support for the MLFL command among Server hosts,
+and the sort of reply received if the Server does not support MLFL. MLFL
+is potentially a 'better' form of communication than mail as the message
+is sent over a data connection rather than the command connection.
+Using the data connection eliminates the 'end-of-mail' marker and
+'command reader' problems sometimes encountered over the command
+connection.
+
+The ground rules of the survey were that all sites listed as Servers in
+the MIT/SAIL Host table were surveyed.  In many cases, a host listed as
+a Server would not respond to an ICP at any time during the period of
+the survey.  Once a host responded with what seemed to me to be a
+'definitive' answer, I marked it as such and stopped surveying it.
+
+                              MLFL Survey
+
+The algorithm used was to ICP to socket 3 of the server (the standard
+old-FTP socket).  Once a 300 response was received, I sent the MLFL
+command.  Where I had the name of a real mailbox at a site (a
+Header-person, for example) I used that, otherwise the name "**".  If a
+site asked for a password (response 504) after the MLFL command I gave
+"USER NETML" "PASS NETML" and retried the MLFL.  If the server replied
+with a 255 SOCK command, I listened for the data-connection to be
+established.  When it was, I transferred the mail file.  Interestingly
+enough, most sites implement an RFC queueing algorithm that will allow
+the user site to attempt to establish the data-connection from its end.
+
+
+
+                                                                [Page 1]
+
+NWG/RFC 751                                          PDL 10 Dec 78 nnnnn
+Survey of FTP MAIL and MLFL
+
+
+
+Complete FTP scripts may be found, if you are interested, on MIT-DM,
+file NETDOC;MLFL SURVEY.
+
+Sites are grouped by the general result they gave.
+
+-site-          -last ftp reply if lost-                -when-
+
+1) Sites that lost for various reasons:
+
+BNL             530 NOT LOGGED IN.                      after MLFL
+HARV-10         431 INVALID ENTRY - Try again           after USER
+LLL-MFE         454 Login please                        after SOCK
+LONDON          000 INDRA FTP Version 2.00  ...         after ICP
+NBS-10          454 Login please                        after SOCK
+WHARTON         454  DATA Connection error ...          after SOCK
+WPAFB-AFAL      454 Login please                        after SOCK
+
+Note: "when" describes the last action performed by the surveyer before
+the indicated anomalous response.
+
+   after ICP --         surveyer had done ICP to socket 3
+   after MLFL --        surveyer had sent MLFL command
+   after USER --        surveyer had sent USER NETML in response to
+                        "504 Login please"
+   after SOCK --        surveyer had attempted to connect to specified
+                        data socket
+
+2) Sites that don't support MLFL and say so:
+
+AFWL            501 ML<?>FL **
+CCA-SPEECH      501 ML<?>FL **
+EGLIN           501 ML<?>FL **
+LBL             506 Command not implemented.
+LONDON-VDH      500 Command unrecognized
+UCLA-CCN        500 COMMAND UNRECOGNIZED
+WPAFB           501 ML<?>FL **
+
+3) Sites that support MLFL (or at least go through all the right
+motions):
+
+AMES-67         MIT-AI          SRI-KL
+BBN-TENEX       MIT-DMS         SU-AI
+BBN-TENEXA      MIT-MC          SUMEX-AIM
+BBN-TENEXD      MIT-ML          UCLA-ATS
+BBN-TENEXE      MIT-XX          UCLA-SECURITY
+BBN-UNIX        NBS-UNIX        USC-ECL
+CCA-TENEX       OFFICE-1        USC-ISI
+CMU-10A         PARC-MAXC       USC-ISIB
+CMU-10B         PARC-MAXC2      USC-ISIC
+
+
+
+                                                                [Page 2]
+
+NWG/RFC 751                                          PDL 10 Dec 78 nnnnn
+Survey of FTP MAIL and MLFL
+
+
+
+DEC-MARLBORO    RADC-TOPS20     USC-ISIE
+I4-TENEX        RAND-RCC        UTEXAS
+ILL-UNIX        RAND-UNIX
+LL              RUTGERS
+LL-ASG          SRI-KA
+
+4) Sites that support MLFL but require "USER NETML" "PASS NETML"
+(Multics):
+
+MIT-MULTICS
+RADC-MULTICS
+
+5) Others:
+
+a) Sites that might support it if I could mail to a real user (some of
+these run operating systems that are "known to work", e.g. TENEX):
+
+BBN-TENEXB      450 No such mailbox at this site.
+CCA-SDMS        450 User Unknown
+CCTC            451 User Not Recognized
+CMU-10D         507  USER NOT FOUND: **
+DTI             451 User Not Recognized
+LL-11           450 User Unknown
+LL-XN           450 User Unknown
+NCSC            451 User Not Recognized
+NOSC-CC         451 User Not Recognized
+NOSC-SDL        451 User Not Recognized
+NTIA-ITS        451 User Not Recognized
+OFFICE-2        450 No such mailbox at this site.
+RADC-XPER       451 User Not Recognized
+SDAC-44         431 User name invalid
+SDAC-UNIX       451 User Not Recognized
+SRI-UNIX        451 User Not Recognized
+
+b) Sites that either never responded to an ICP to socket 3, or were not
+accepting FTP users:
+
+ANL             I4B-TENEX       NOSC-SECURE1
+ARPA-DMS        ISI-SPEECH11    NSWC-WO
+CMU-CMMP        LBL-UNIX        NUSC    
+CTO-DDS         LLL-COMP        NUSC-NPT
+DTNSRDC         MOFFET-ARC      NWC
+FNWC            NADC            NYU
+GUNTER-UNIX     NDRE            PENT-UNIX
+
+
+
+
+
+
+
+
+                                                                [Page 3]
+
+NWG/RFC 751                                          PDL 10 Dec 78 nnnnn
+Survey of FTP MAIL and MLFL
+
+
+
+                              MAIL Survey
+
+The mechanics of the MAIL survey were similar to those of the MLFL
+survey.  The command was "MAIL Fzorkness" (an account unlikely to exist
+on any host).  The responses are grouped into a few general categories.
+
+Complete FTP results may be found on MIT-DM, file NETDOC;MAIL SURVEY.
+
+-site-          -last response-
+
+1) Sites that lost completely.
+
+LONDON          000 INDRA FTP Version <>.00  ...
+
+2) Sites that accept mail to an unknown recipient.
+
+BNL             MIT-ML          USC-ISI
+MIT-AI          RAND-RCC        USC-ISIB
+MIT-DMS         UCLA-CCN        USC-ISIC
+MIT-MC          USC-ECL         USC-ISIE
+
+3) Sites that refuse mail to an unknown recipient (grouped by response).
+
+SDAC-44         431 User name invalid
+
+BBN-TENEX       450 No such mailbox at this site.
+BBN-TENEXA      450 No such mailbox at this site.
+BBN-TENEXB      450 No such mailbox at this site.
+BBN-TENEXD      450 No such mailbox at this site.
+BBN-TENEXE      450 No such mailbox at this site.
+BBN-UNIX        450 User Unknown
+CCA-SDMS        450 User Unknown
+CCTC            451 User Unknown
+EDN-UNIX        450 User Unknown
+I4-TENEX        450 No such mailbox at this site.
+ILL-UNIX        450 User unknown
+LL              450 No such mailbox at LL
+LL-ASG          450 User unknown
+LL-XN           450 User unknown
+MIT-MULTICS     450  Cannot locate mailbox for \Fzorkness\
+MIT-XX          450 No such mailbox at this site.
+NBS-UNIX        450 User Unknown
+NCSC            450 User Unknown
+NOSC-CC         450 User Unknown
+NOSC-SDL        450 User Unknown
+NTIA-ITS        450 User Unknown
+OFFICE-1        450 No such mailbox at this site.
+OFFICE-2        450 No such mailbox at this site.
+PARC-MAXC       450 No such mailbox at this site.
+
+
+
+                                                                [Page 4]
+
+NWG/RFC 751                                          PDL 10 Dec 78 nnnnn
+Survey of FTP MAIL and MLFL
+
+
+
+PARC-MAXC2      450 No such mailbox at this site.
+RADC-XPER       450 User Unknown
+RADC-MULTICS    450  Cannot locate mailbox for \Fzorkness\
+RADC-TOPS20     450 No such mailbox at this site.
+RAND-UNIX       450 User Unknown
+RUTGERS         450 No such mailbox at this site.
+SDAC-UNIX       450 User Unknown
+SRI-KA          450 No such mailbox at this site.
+SRI-KL          450 No such mailbox at this site.
+SU-AI           450 I don't know anybody named Fzorkness
+SUMEX-AIM       450 No such mailbox at this site.
+UCLA-ATS        450 User Unknown
+UCLA-SECURITY   450 User Unknown
+UTEXAS          450 User Unknown
+
+CCA-TENEX       451 No such mailbox at this site.
+
+AFWL            501 MA<?>IL Fzorkness
+CCA-SPEECH      501 MA<?>IL Fzorkness
+EGLIN           501 MA<?>IL Fzorkness
+WPAFB           501 MA<?>IL Fzorkness
+
+AMES-67         503 COMMAND \MAIL FZORKNESS\ IGNORED: UNKNOWN USER
+
+LBL             506 Command not implemented.
+
+CMU-10A         507 % USER NOT FOUND: FZORKNESS
+CMU-10B         507 % USER NOT FOUND: FZORKNESS
+CMU-10D         507 % USER NOT FOUND: FZORKNESS
+HARV-10         507  No such user as FZORKNESS
+LLL-MFE         507  No such user as FZORKNESS
+NBS-10          507  No such user as FZORKNESS
+WHARTON         507  No such user as FZORKN
+WPAFB-AFAL      507  No such user as FZORKNESS
+
+4) Sites to which I was never able to connect, or which were not
+accepting users.
+
+ANL             I4B-TENEX       NOSC-SECURE1
+ARPA-DMS        ISI-SPEECH11    NSWC-WO
+CMU-CMMP        LBL-UNIX        NUSC
+CTO-DDS         LL-11           NUSC-NPT
+DEC-MARLBORO    LLL-COMP        NWC
+DTI             LONDON-VDH      NYU
+DTNSRDC         MOFFETT-ARC     SRI-UNIX
+FNWC            NADC            SU-ISL
+GUNTER-UNIX     NDRE
+
+
+
+
+
+                                                                [Page 5]
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