trigger relay

基本解释

By default mail with a From address that is in whitelist_from_rcvd that does not match the relay will trigger a forgery rule.
默认情况下，发信地址在 white_from_rcvd 中，但是中继服务器却不是列出的那个，这种情形会触发一个测试伪造的规则。
ydirone.blog.163.com
Most switch mainframes can be triggered externally via the trigger input and can send an output trigger pulse when the relay contacts have settled.
大多数开关主机都可通过触发输入进行外部触发，并且在继电器触点稳定之后可输出一个触发脉冲。
In power system, it can excite partial parallel resonance or serial resonance, enlarge the harmonic wave, trigger relay protection system in error and disturb electric power energy metering equipment.
在电力系统，它可以刺激局部并联谐振或串联谐振，放大谐波，引发继电保护系统误差和扰乱电力能源计量设备。