Advantages
The primary advantage of this system for e-mail recipients is it allows the signing domain to reliably identify a stream of legitimate email, thereby allowing domain-based blacklists and whitelists to be more effective. This is also likely to make some kinds of phishing attacks easier to detect.
There are some incentives for mail senders to sign outgoing e-mail:
- It allows a great reduction in abuse desk work for DKIM-enabled domains if e-mail receivers use the DKIM system to identify forged e-mail messages claiming to be from that domain.
- The domain owner can then focus its abuse team energies on its own users who actually are making inappropriate use of that domain.
Read more about this topic: Domain Keys Identified Mail
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—Virginia Woolf (1882–1941)