On Tue, 29 Apr 2008, Karl Boyken wrote:
; As a solution to the problem of sendmail munging headers after the DKIM
; signature has been calculated, the dkim-milter README suggests routing mail
; between one port, where all the munging occurs, and another port, where
; dkim-milter runs. I use DaemonPortOptions and am clear about that aspect, but
; I'm scratching my head over the routing bit. I suspect I'd need to either
; create a LOCAL_RULE_0 or use virtusertable somehow, but I'm not sure about
; specifics yet, and it seems to me there'd be a danger of creating a loop if I
; botched it. If anyone has some suggestions or examples, or could outline
; potential pitfalls, I'd be grateful. Thanks.
I'd probably create a queue-group triggered on the daemon name from
DaemonPortOptions, then a LOCAL_RULE_0 to force routing back to localhost
for messages in that queue group. You'll need to use a mailer with the k
flag set for that otherwise Sendmail will detect a loop based on the
HELO/Banner matching.
So, something like the following:
DAEMON_OPTIONS(`Name=MTA')dnl
DAEMON_OPTIONS(`Name=dkim,Addr=..,Port=...')dnl
QUEUE_GROUP(`dkim', `P=/.../../dkim')dnl
MAILER_DEFINITIONS
Mlooprelay, P=[IPC], F=kmDFMuXa8,
S=EnvFromSMTP/HdrFromSMTP, R=MasqSMTP, E=\r\n, L=2040,
T=DNS/RFC822/SMTP,
A=TCP $h 25
LOCAL_CONFIG
Kstorage macro
C{persistentMacros} {qassignment}
LOCAL_RULESETS
SWhichQueueGroup
# Is the macro already set ?
R$* $: $1 $| $&{qassignment}
R$* $| $+ $@ $2
# Was the connection to the dkim MTA?
Rdkim $| $@ dkim $(storage {qassignment} $@ dkim $)
R$* $| $@
# Ruleset to select queue group for incoming messages.
Squeuegroup
R$* $: $1 $| $> WhichQueueGroup $&{daemon_name}
R$* $| $+ $#$2
R$* $| $#
LOCAL_RULE_0
# Drop back to ruleset 0 if rebuilding aliases
R$* $: $1 $| $&{opMode}
R$* $| i $@ $1
# Drop back to ruleset 0 for unqualified and local addresses
R$- $| $* $@ $1
R$+ < @ $=w . > $| $* $@ $1
# Force to localhost for dkim queue group
R$* $| $* $: $1 $| $> WhichQueueGroup $&{daemon_name}
R$* $| dkim $#looprelay $@ [localhost] $: $1
# Everything else uses DNS/mailertable
R$* $| $* $@ $1
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