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See this DKIM FAQ:<br />
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DKIM Frequently Asked Questions <br />
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<a href="http://dkim.org/info/dkim-faq.html" rel="ugc">http://dkim.org/info/dkim-faq.html</a><br />
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I'd say that automatically failing them will only guarantee the delivery of messages that are sent by DKIM participants. That is by no means every legitimate email user who may want to send you email.
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See this DKIM FAQ:

DKIM Frequently Asked Questions

http://dkim.org/info/dkim-faq.html [http://dkim.org/info/dkim-faq.html]

I'd say that automatically failing them will only guarantee the delivery of messages that are sent by DKIM participants. That is by no means every legitimate email user who may want to send you email.

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Sorry, I don't think I understand what you mean. If you mean that by blocking emails that fail DKIM verification will block legitimate emails that do not use DKIM, then that is absolutely false. If an incoming email is not signed (not using DKIM) then it is impossible to fail DKIM verification. Only emails that implement DKIM (are digitally signed) have DKIM verification performed. Thus if DKIM verification is not performed then it cannot fail. My question is that if an incoming email USES DKIM SIGNING and subsequently fails DKIM verification then should it be blocked.
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Sorry, I don't think I understand what you mean. If you mean that by blocking emails that fail DKIM verification will block legitimate emails that do not use DKIM, then that is absolutely false. If an incoming email is not signed (not using DKIM) then it is impossible to fail DKIM verification. Only emails that implement DKIM (are digitally signed) have DKIM verification performed. Thus if DKIM verification is not performed then it cannot fail. My question is that if an incoming email USES DKIM SIGNING and subsequently fails DKIM verification then should it be blocked.

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Is it wrong to block emails that fail DKIM verification?
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Is it wrong to block emails that fail DKIM verification?

What should be done with incoming emails that fail DKIM verification?

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Internet / Email Software

Email Software

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.