Email Bouncing - anyone else seeing this problem , error code AUP#In-1300
Is anyone having issues sending to charter.net addresses from Exchange Online? It started for me around 9:30 AM on Saturday.
We get these bouncebacks:
Your email couldn't be forwarded from [removed my email address for security] to another email address.
Your message was rejected by the recipient email server. Please check the recipient's email address and try resending your message, or contact the recipient directly. For more tips to help resolve this issue, see DSN code 5.1.0 in Exchange Online - Office 365. If the problem continues, contact your email admin.
mpin018.msg.chrl.nc.charter.net gave this error:
40.107.93.51 blocked. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes for more information. AUP#In-1300
I contacted Spectrum tech support, and they said to send a blank message with title "unblock" to [email protected], and then to allow up to 72 hours for it to be fixed.
Answers
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Good evening @HikerLT
Thank you for reaching out to us about the message you are receiving when trying to email to charter.net. This particular error message means:
"Spectrum limits the number of concurrent connections from a sender, as well as the total number of connections allowed. Limits vary based on the reputation of the IP address. Reduce your number of connections and try again later."
If this error message is not cleared after 72 hours and you are using our email addresses within the guidelines listed please let us know. - Lyn
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Same issue here. 40.107.0.0/16 are published O365 exchange address's
Office 365 URLs and IP address ranges - Microsoft 365 Enterprise | Microsoft Learn
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