502 should be a access denied error. It means in the process of relaying your email to the SMTP server, some middle SMTP server rejects your mail. It's a scheme to design to reduce email spam.

jeffrey815 (Smartiecat)
The solution is to use your immediate SMTP server which should be the SMTP server of your ISP. Because blocking does not apply to big SMTP (such as ISP's) server.
2002-2-4 -04:00
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Back To Topic: 我用Foxmail发邮件,无论用哪个免费邮箱的SMTP服务器,如smtp.163.net, smtp.km169.net等等,都会报错,错误码大概是502。这是怎么回事?

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