set ORIGINAL_RECIPIENT in the environment of mda scripts

mostly for compatibility with postfix since some mdas (like
public-inbox) make use of it.

diff from Philipp (philipp+openbsd [at] bureaucrac

set ORIGINAL_RECIPIENT in the environment of mda scripts

mostly for compatibility with postfix since some mdas (like
public-inbox) make use of it.

diff from Philipp (philipp+openbsd [at] bureaucracy [dot] de)
ok gilles@

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add required headers for smtpd.h and remove unnecessary ones in other files.

ok jung@

Run lmtp deliveries as SMTPD_USER instead of the recipient user.

ok millert@

add SENDER to mda environment and teach lmtp to use that instead of command
line parameter. this allows simplifying lmtp command line and it would have
prevented the unpriv command exec for LMTP in r

add SENDER to mda environment and teach lmtp to use that instead of command
line parameter. this allows simplifying lmtp command line and it would have
prevented the unpriv command exec for LMTP in recent advisory.

ok millert@ and jung@

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extract subaddress from last resolved node, not from dest or rcpt address
which was incorrect and can lead to ambiguous cases, this will affect the
people who were using subaddresses within aliases t

extract subaddress from last resolved node, not from dest or rcpt address
which was incorrect and can lead to ambiguous cases, this will affect the
people who were using subaddresses within aliases themselves AND expected
deliveries to a maildir subdir of the recipient user.

ok eric@

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in mda variables expansions, do not consider empty strings as errors since
an empty %{sender} is really a mailer-daemon and not an error

reported and initial diff by Lauri Tirkkonen <lotheac@iki.fi>

in mda variables expansions, do not consider empty strings as errors since
an empty %{sender} is really a mailer-daemon and not an error

reported and initial diff by Lauri Tirkkonen <lotheac@iki.fi>
commit is a revised version of the diff based on a discussion with eric@

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err -> errx

diff from Lauri Tirkkonen <lotheac@iki.fi>

add support for mda wrappers allowing postmaster to define command wrappers
that will be executed (with recipient privileges) before calling the users'
mail delivery agent

ok eric@

split forkmda() in two:
- forkmda() creates the process that will be used for the delivery and does
the switching of privileges then calls mda_unpriv()
- mda_unpriv() runs with privileges of the re

split forkmda() in two:
- forkmda() creates the process that will be used for the delivery and does
the switching of privileges then calls mda_unpriv()
- mda_unpriv() runs with privileges of the recipient, it expands variables,
sets up environment and executes the mda

ok millert@ and eric@

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