DKIM（DomainKeys Identified Mail）是一种电子邮件的验证技术，使用密码学的基础提供了签名与验证的功能。

一般来说，发送方会在电子邮件的标头插入DKIM-Signature及电子签名信息。而接收方则透过DNS查找得到公开密钥后进行验证。

DKIM是由DomainKeys所改进的协定，大多数的运作方式与DomainKeys相同。在2007年2月时，DKIM被列入互联网工程工作小组（IETF）的标准提案（Proposed Standard），并于同年5月成为正式标准（Standards Track）。

DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain is authorized by that domain's administrators. It is intended to prevent forged sender addresses in emails, a technique often used in phishing and email spam. DKIM allows the receiver to check that an email claimed to come from a specific domain was indeed authorized by the owner of that domain which is done using cryptographic authentication.