Add support for configurable DKIM key sizes #3030
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In order to support DKIM RSA key sizes other than 1024, a new config variable default_dkim_key_size has been introduced. The default value still is 1024 to make it backwards compatible, but it now supports e.g. 2048 or 4096 bit keys as well.
At the time of this commit (mid-2024), having 2048 bit keys is recommended by the National Institute of Standards and Technology (NIST)