550 The domain sg-international.com is currently suspended. Try later.
2016/5/31 14:51:51 点击：
550 The domain sg-international.com is currently suspended. Try later.
退信原因：域名被服务商挂起或者锁定
解决方案：这个问题，不是发送方的问题，是对方域名的问题，只能等对方恢复了才能进行邮件的收发，出现这个问题往往是对方的域名过期没有续费或者被滥用等等，导致被锁定了，比如访问对方网站的时候，也出现了下面的错误提示：This account has been suspended.Either the domain has been overused, or the reseller ran out of resources.
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