Thread View: comp.mail.misc
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Started by Hochleitner
Fri, 06 Nov 1992 10:45
mail-sendmail-relation
Author: Hochleitner
Date: Fri, 06 Nov 1992 10:45
Date: Fri, 06 Nov 1992 10:45
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I am very interested in the relation between mail and sendmail. It is clear to me, that mail is the Ua, which enables better user interface, and sendmail is the Tma, who is responsible for the delivery of the mail. I meen the process communication between mail and sendmail (only the pipe is not enough). ANother important question in this field is, how sendmail fills its "standard macros" like $g, $w and ohters, because not all these macros are set explicitly in the sendmail.cf file. Any suggestions, hints or comments are highliy recommende! ------------------------------------------------------------------------------ Andreas Hochleitner phone: +44 1 81111 4139 <<< KAPSCH AG fax: +44 1 81111 4156 A-1120 Wien,Wagenseilg. 1 email: Andreas.Hochleitner@kapsch.co.at ------------------------------------------------------------------------------ -- ------------------------------------------------------------------------------ Andreas Hochleitner phone: +44 1 81111 4139 <<< KAPSCH AG fax: +44 1 81111 4156 A-1120 Wien,Wagenseilg. 1 email: Andreas.Hochleitner@kapsch.co.at
Re: mail-sendmail-relation
Author: Neil Rickert
Date: Fri, 06 Nov 1992 18:41
Date: Fri, 06 Nov 1992 18:41
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In article <1992Nov6.104509.16949@hp4at.eunet.co.at> optkap@hp4at.eunet.co.at (Hochleitner) writes: >I am very interested in the relation between mail and sendmail. There are actually several different programs called 'mail', and there are other programs (elm, mush are examples) which do something similar. >It is clear to me, that mail is the Ua, which enables better user interface, >and sendmail is the Tma, who is responsible for the delivery of the mail. The user agent, say /usr/ucb/mail, prepares the message, then pipes it in /usr/lib/sendmail -oi address address ... Sendmail fills in any remaining headers, determines how it should be routed, and attempts to deliver it to the next host on the route. If the mail is for a local user, sendmail pipes it to the local delivery agent, commonly /bin/mail. >I meen the process communication between mail and sendmail (only the pipe is >not enough). Usually there is just the pipe and the parameter list. The important part of the parameter list is the list of recipient addresses. There is usually a '-oi' which means that the message should not terminate at the first '.', and there may be one or two other options. > ANother important question in this field is, how sendmail >fills its "standard macros" like $g, $w and ohters, because not all these >macros are set explicitly in the sendmail.cf file. $w is set by first using gethostname(), then using that as an argument to gethostbyname(). If you are using a nameserver, the result should be the fully qualified domain name of your host. If you are not using a nameserver, possible the value of gethostname() will be used, or the first entry on the line in /etc/hosts which matches this name. If necessary you can actually override this with a 'Dw' line in the configuration file. $g is the address after processing by the rewrite rules. The sender address is processed by rulesets 3,1, S=, 4 [where S= is the ruleset named on the "S=" operand of the outbound mailer].
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