DKIM KEYS Consideration

March 6, 2021
DKIM, DMARC
1 min read

Messages with DKIM signatures use a key to sign messages. Messages signed with short keys can be easily spoofed (see http://www.kb.cert.org/vuls/id/268267), so a message signed with a short key is no longer an indication that the message is properly authenticated. To best protect  users, Gmail will begin treating emails signed with less than 1024-bit keys as unsigned, starting in January 2013.
We highly recommend that all senders using short keys switch to RSA keys that are at least 1024-bits long

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