Michael Sofka wrote:
On Wednesday 16 March 2005 04:10 pm, Chris Myers wrote:I have the first edition of Sendmail (Copyright 1993 O'Reilly, printed November 1993, Page 191 "Uses of checkcompat () in conf.c:
Well, after nearly 6 years and lots of hand wringing, we finally were awarded US patent 6,868,498 for our user-level blacklisting as long-ago disclosed to the ASRG in http://www.shaftek.org/publications/asrg-ipr.html#4.2 .
USPTO link: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/ne tahtml/search-bool.html&r=1&f=G&l=50&co1=AND&d=ptxt&s1=6,868,498.WKU.&OS=PN/ 6,868,498&RS=PN/6,868,498
We even got a little bit of coverage from our local press http://www.bizjournals.com/pacific/stories/2005/03/14/daily22.html?f=et71
We take the mail-from/rcpt-to pair to decide whether to return an error
before the DATA command is accepted.
Page 512--513 of the Second edition of "Sendmail" by Costales and Allman, O'Reilly, 1997, Section 29.10.4 The check_compat Rule Set.
Not all situations can be resolved by simply checking the recipient or sender address. Sometimes you will need to make judgement based on pairs of addresses....
Other uses for the check_compat rule set might be the followwing ...
* Screening a particular recipient to prevent that user from receiving objectionable mail form a specific source.
I gave away my copy of the first edition (cpright 1993), but I believe it gave a similar example, but using the checkcompat() routine. If any list members have a copy of the first edition, please post.
Mike
How checkcompat() works:
... Next, it calls the checkcompat() routine. If checkcompat() returns TRUE the message is delivered. Otherwise the message is rejected. The checkcompat() routine is called once for each recipient...
The argument given to checkcompat () is Address *to... Envelope information is available in the global variable CurEnv. There are three examples for checkcompat. One example illustrates the usage of a do-while loop, which checks each one of the recipient.
This is under circumstances an interessting Usenet Posting (1994-01-19 03:01:15 PST) Message-ID: <[EMAIL PROTECTED]>: ... compares the envelope sender and recipient addresses and returns an error if the condition is met that
Or this posting (Message-ID: <[EMAIL PROTECTED]>):
Permission is based on entries contained in an authorisation
file ( /usr/local/lib/mail/mail_auth by default). Each line
has four entries: channel name , OK or BLOCK , sender
address , recipient address(es) . The channel name is a
string indicating the name of the outgoing channel. The
sender and recipient addresses are full regular expressions.....
A record of the results is stored in a log file (
/usr/adm/mail_auth.log by default). Sucessful comparisons
have a record prefixed with 'O' (Outgoing) and rejected mes-
sages have an 'R' flag.
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