X-Git-Url: http://git.marmaro.de/?a=blobdiff_plain;f=man%2Fpost.man;h=45261778f4d7250c95e3a6c4e1eb522063ca1de7;hb=077b355833f623241d5d145810b91da60e4c260c;hp=397901a5f842de15c052375a1993b4cba3bdcefe;hpb=1691e80890e5d8ba258c51c214a3e91880e1db2b;p=mmh

diff --git a/man/post.man b/man/post.man
index 397901a..4526177 100644
--- a/man/post.man
+++ b/man/post.man
@@ -73,9 +73,48 @@ The `\-watch' switch indicates that the user would like to watch the
 transport system's handling of the message (e.g., local and \*(lqfast\*(rq
 delivery).
 
-\fIPost\fR consults the environment variable \fB$SIGNATURE\fR to determine
-the sender's personal name in constructing the \*(lqFrom:\*(rq line of
-the message.
+Under normal circumstances, \fIpost\fR constructs the "From:" line of the
+message from the user's login name, the full name from the GECOS field of the
+passwd file, and the fully\-qualified name of the local machine (or the value of
+"localname" in mts.conf, if set).  An example is "From: Dan Harkless
+<dan@machine.company.com>".  There are four ways to override these values,
+however.  Note that they apply equally to "Resent\-From:" lines in messages sent
+with \fIdist\fR.
+
+The first way is GECOS\-based username masquerading.  If the "masquerade:" line
+in mts.conf contains "mmailid", this processing is activated.  If a user's GECOS
+field in the passwd file is of the form "Full Name <fakename>" then "fakename"
+will be used in place of the real username.  For instance, a GECOS field of "Dan
+Harkless <Dan.Harkless>" would result in "From: Dan Harkless
+<Dan.Harkless@machine.company.com>".  Naturally if you were doing something like
+this you'd want to set up an MTA alias (e.g. in /etc/aliases) from, for
+instance, "Dan.Harkless" to "dan".
+
+The second way to override default construction of "From:" is to set the
+\fB$SIGNATURE\fR environment variable.  This variable overrides the full name
+from the GECOS field, even if GECOS\-based masquerading is being done.  This
+processing is always active, and does not need to be enabled from mts.conf.
+
+The third way is controlled by the "user_extension" value of "masquerade:" line
+of mts.conf.  When that's turned on, setting the \fB$USERNAME_EXTENSION\fR
+environment variable will result in its value being appended the user's login
+name.  For instance, if I set \fB$USERNAME_EXTENSION\fR to "+www", my "From:"
+line will contain "Dan Harkless <dan+www@machine.company.com>" (or
+"Dan.Harkless+www" if I'm using mmailid masquerading as well).  Recent versions
+of sendmail automatically deliver all mail sent to \fIuser\fR+\fIstring\fR to
+\fIuser\fR.  qmail has a similar feature which uses '\-' as the delimiter by
+default, but can use other characters as well.
+
+The fourth method of address masquerading is to specify a "From:" line manually
+in the message draft.  It will be used as provided (after alias substitution),
+but normally, to discourage email forgery, the user's \fIreal\fR address will be
+used in the SMTP envelope "From:" and in a "Sender:" header.  However, if the
+"masquerade:" line of mts.conf contains "draft_from", the SMTP envelope "From:"
+will use the address given in the draft "From:", and there will be no "Sender:"
+header.  This is useful in pretending to send mail "directly" from a remote POP3
+account, or when remote email robots give improper precedence to the envelope
+"From:".  Note that your MTA may still reveal your real identity (e.g.
+sendmail's "X\-Authentication\-Warning:" header). 
 
 .Fi
 ^%etcdir%/mts.conf~^nmh mts configuration file
@@ -87,7 +126,7 @@ the message.
 .Sa
 \fIStandard for the Format of ARPA Internet Text Messages\fR (RFC\-822),
 .br
-mhmail(1), send(1), mh\-mail(5), mh\-alias(5)
+mhmail(1), send(1), mh\-mail(5), mh\-alias(5), mh\-tailor(5)
 .De
 `\-alias %etcdir%/MailAliases'
 .Ds