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SMTP诊断工具用于通过尝试向SMTP服务器发送消息，同时在日志窗口中实时显示所有诊断信息来识别SMTP服务器问题并进行故障排除。日志窗口将显示发送过程中的所有数据，包括错误消息和最终结果（成功或失败）。
smtp-diag-tool
Software as a Service (SaaS)版SMTP Diag Tool的替代品
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Web Utils
Web monitoring service, which checks website every 5 minutes. It detects when it's offline, redirected, broken or even hacked. Provides SMS and email notifications, statistics and logs.
