Aspirin: 不用指定任何smtp服务器,用JAVA发email 可以帮你发出email,  不用你显式指定一个smtp服务器。


看了一下它的源码,原来它的原理是: 当你指定收件人为xxx@yyy.com时,它会试着去DNS上找一下yyy.com对应的MX记录,作为临时的smtp server:   MX = a type of resource record in the Domain Name System that specifies a mail server responsible for accepting email messages on behalf of a recipient’s domain

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