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

ok jung@

replaces calls to err(3)/errx(3) with fatal()/fatalx() from log.c
for code that runs in the daemon.

ok florian@ millert@

increase number of connections a local address is allowed to establish
decrease the delay between transactions in the same session

ok eric@

use <limits.h> comprehensively. For now try to push <> includes to
each .c file, and out of the .h files. To avoid overinclude.
ok gilles, in principle. If this has been done right, -portable shou

use <limits.h> comprehensively. For now try to push <> includes to
each .c file, and out of the .h files. To avoid overinclude.
ok gilles, in principle. If this has been done right, -portable should
become easier to maintain.

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internal improvements and cleanups

- get rid of the whole penalty thing for failed envelopes in the mta and scheduler.
- do not disable routes on smtp errors
- try to schedule all types of envelopes

internal improvements and cleanups

- get rid of the whole penalty thing for failed envelopes in the mta and scheduler.
- do not disable routes on smtp errors
- try to schedule all types of envelopes on each scheduler frame.

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Implement a feedback mechanism which allows the mta to "hold" envelopes
in the scheduler when it has too many tasks for a given relay. The
envelopes are put on a wait queue, and are not scheduled ag

Implement a feedback mechanism which allows the mta to "hold" envelopes
in the scheduler when it has too many tasks for a given relay. The
envelopes are put on a wait queue, and are not scheduled again until
the mta "releases" some envelopes from that queue.

It prevents from having too many inflight envelopes, which are out of reach
for the admin.

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Many MTA improvements:

- Better transient error handling logic: failing destinations are
automatically disabled for a while. When a destination is active
again, ask the scheduler to retry previ

Many MTA improvements:

- Better transient error handling logic: failing destinations are
automatically disabled for a while. When a destination is active
again, ask the scheduler to retry previous envelopes immediatly.
- More informative error report when all routes fail for a mail.
- Implement a "smtpctl show hoststats" command to get the latest stat
message per MX domain.
- Implement a "smtpctl show routes" command to show the state the
currently known routes to remote MXs.
- Implement a "smtpctl resume route" command to re-enable a route that
has been disabled.
- Do not hardcode limits
- Minor code improvements

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