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opensmtpd-filter-dkimsign adds a dkim signature to the email message.
It supports the rsa and ed25519 signing algorithms.
mandoc is needed only at build time.
It is recommended to run filter-dkimsign as a non root user. For
example, create a user and group "_dkimsign" (this name has come from
an example in smtpd.conf(5)):
groupadd -g 376 _dkimsign
useradd -u 376 -g 376 -s /sbin/nologin -M _dkimsign
The private key must be readable by this user.
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