Hello, I'm looking for a contact at Spectrum.net in regards to blocking IPs belonging to an ESP. The bounce message we're getting just says "too many connections" but we've already reduced simultaneous connections to 1 and tried increasing the number of connections, without any noticeable effect.
Full bounce message is: 550 5.1.0 <redacted> sender rejected. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes for more information. AUP#In-1310 Any clues would be most appreciated, thanks! Tim Starr
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