550 未采取请求的操作：邮箱不可用或不是本地的
已为客户建立了一个小型网站，但提交的联系表格未发送至他们的电子邮件地址。
退回邮件附有以下消息：
550 Requested action not taken: mailbox unavailable or not local
它毫无问题地发送到我的电子邮件地址和其他人，但无法到达其域中的任何地址。
客户的IT人员有点无能，所以我不确定他是如何配置邮件服务器的？
Have set up a small website for a client however contact form submissions are not getting through to their email address.
The bounce back has this message attached:
550 Requested action not taken: mailbox unavailable or not local
It sends without issue to my email address and others but can't get to any on their domain.
Client's IT guy is a bit clueless so I'm unsure how he's configured the mail server?
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您可能将电子邮件发送到不正确的电子邮件地址，或者可能将电子邮件发送到该域（或类似）的 http 服务器，但 SMTP 服务器托管在其他地方。
You're probably sending the emails to an incorrect email address, or possible the emails are being sent to the http server for the domain (or similar) but the SMTP server is hosted elsewhere.
发现问题是由于网络服务器具有最大条目数，这意味着它试图向自身而不是外部邮件服务器发送邮件。
删除 DNS 条目解决了该问题。
Found the problem, was due to webserver having max entries which meant it was trying to send mail to itself rather than the external mail server.
Deleting DNS entries fixed the problem.