Hi all, Could someone from Charter/Spectrum postmaster contact me off-list, or point me to the right channel?
Seven of our sending IPs have been refused at connect by Charter since at least 21 September: 554 impin018.msg.chrl.nc.charter.net cmsmtp 157.230.21.244 blocked. Please see https://www.spectrum.net/support/internet/understanding-email-error-codes for more information. AUP#In-1000 IPs (rDNS matches, all with SPF/DKIM/DMARC): 157.230.25.185 smtp-cdf01.leadhub.cz 167.99.253.95 smtp-cdf02.leadhub.cz 157.230.104.212 smtp-cdf03.leadhub.cz 157.230.21.244 smtp-cdf04.leadhub.cz 157.230.21.106 smtp-cdf05.leadhub.cz 167.99.253.86 smtp-cdf06.leadhub.cz 157.230.28.215 smtp-cdf09.leadhub.cz Last rejections: 2026-10-27 between 12:50 and 13:03 UTC, from mx0.charter.net and pkvw-mx.msg.pkvw.co.charter.net. Our other IPs (smtp-cwb*.leadhub.cz, 37.157.192.0/22) deliver to Charter normally. So this looks like a reputation block on these specific addresses (DigitalOcean space) rather than a problem with our mail as a whole. [email protected] hasn’t replied, and unblock@ and [email protected] bounce as non-existent. If something specific triggered the block, we’re happy to investigate and fix it on our side. Thanks, Manu Deliverability, Leadhub
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