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I'm trying to determine what level of encryption salesforce supports for DKIM keys? In sum, when Salesforce generates a DKIM key, is it using 1024 bit encryption or 2048 bit encryption?

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It is using 1024 bits as of today, February 6th 2019. Keys are rotated often though.

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    Please include a link to the source for your answer. See How to Answer
    – Dave Humm
    Feb 6, 2019 at 17:01
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The salesforce documentation does not explicitly describes the DKIM RSA key size, but the options are visible when creating a new key: it is either 1024-bit or 2048-bit (attached screenshot for reference)

Take note of following recommendation, which is also mentioned in salesforce documentation in above link and setup page when creating a new key:

Consider industry-specific security regulations or email recipient limitations when chosing a RSA key size. Some regulations, such as the Federal Information Processing Standard (FIPS), require specific key sizes.

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