Hi folks,
On some of our IPs we get a lot of 421 4.7.0 [TSS04] SMTP responses from Yahoo. I cannot get a clear explanation from them and I see that this error code is not listed in their official SMTP error code table. It seems to be a newly implemented error code and since they already had error codes about complaints or unusual traffic what does this one could mean ? More details would be helpful. Regards, Mathieu.
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