DomainKeys Identified Mail (DKIM) is the successor to Yahoo DomainKeys. Both share similarities, however, DKIM has the additional aspects of Cisco's Identified Internet Mail standard (IIM). The enhancements to this standard give more security and flexibility than DomainKeys alone. Some of the main differences between DK and DKIM are the following:
| DKIM | DomainKeys |
| Allows for multiple signature algorithms. | Only allows one signature algorithms. |
| Has more options that would allow you to validate both the header and body. | |
| Allows third parties to sign. | |
| Allows self-sign the DKIM-Signature header field. | Helps protect against modification. |
| Gives you the option to use a wildcard on some parameters. | |
| Supports signature timeouts in DNS. |
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