Yandex / SMTP error code 554

smtp;554 5.7.1 [1] Message rejected under suspicion of SPAM; https://ya.cc/1IrBc ##

High severity

While a message being rejected as spam isn't good news for anyone, this bounce response is especially helpful for those who don't typically send to Russian domains. In those cases, you'll see this bounce when online forms are being exploited by spam bots repeatedly victimizing Yandex recipients. Please check all of your online forms to be sure that they are properly protected.

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Built with

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