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Despite the default semantics for `InternalHosts` option in
opendkim.conf, OpenDKIM seems to generally only consider the labeled
sender of a message when deciding whether to sign a message or validate.
This means that previously, when a message was sent to a mailing list
from a domain outside of the mailnode host, the copies of this message
that the list sent out did not get a signature applied to them.
Since we will usually be injecting headers for mailing list information,
we can search these first to determine the message envelope sender.
X-Mailing-List will be the list's full address. Sender is added just in
case. Advice is taken from the "Mailing Lists" section of
http://www.opendkim.org/opendkim-README
Signed-off-by: Malfurious <m@lfurio.us>
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Signed-off-by: Malfurious <m@lfurio.us>
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Signed-off-by: Malfurious <m@lfurio.us>
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We use a hard-coded key selector of "default" and store keyfiles in the
dkim volume. `Domain` indicates the mail sources for which mail should
be signed rather than verified.
Because we are using ENV_VIRTUAL_DOMAINS in this context, we now require
the variable to be comma separated (no whitespace), as that is what this
file requires. All previous usages of ENV_VIRTUAL_DOMAINS are
compatible with comma separation.
Signed-off-by: Malfurious <m@lfurio.us>
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Signed-off-by: Malfurious <m@lfurio.us>
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