optional size in bytes, if message is larger than this treshold it gets cached to disk (assuming cacheDir is set and writable). Defaults to 131072 (128 kB).
is the domain name to use in the signature
optional algorithm for the body hash, defaults to ‘sha256’
an optional colon separated list of header keys to sign (eg. message-id:date:from:to...')
is the DKIM key selector
is the private key for the selector in PEM format
optional colon separated list of header keys not to sign. This is useful if you want to sign all the relevant keys but your provider changes some values, ie Message-ID and Date. In this case you should use 'message-id:date' to prevent signing these values.
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optional location for cached messages. If not set then caching is not used.