Just a wild guess - could it be that some recipient confused their "Junk" folder for "Trash", generating a significant spam/ham ratio signal due to the low total number of messages? In addition to requesting mitigation from Spectrum, you might want to "educate" the recipients politely.
Cheers, Hans-Martin Am 12. Mai 2026 03:43:06 schrieb Kyle Hendricks via mailop <[email protected]>: > Hi all, > > First time posting. Hoping someone with Charter/Spectrum-side visibility can > take a look or point me to a working contact path. > > My personal/family domain hendricks.nu (Google Workspace, in use ~10 years, > low volume, a handful of personal emails per week) is being rejected by > Charter/Spectrum at the sender level. Bounces look like: > > 550 5.1.0 <[email protected]> sender rejected. Please see > https://www.spectrum.net/support/internet/understanding-email-error-codes > for more information AUP#In-1010 > > This affects mail to charter.net, chartermi.net, and presumably the other > Spectrum-managed domains. The block appears to be on the sender address or > domain rather than the sending IP (a Google Workspace shared outbound). > > What I've checked and done: > > - Auth is clean: SPF pass (include:_spf.google.com), DKIM pass with a custom > 2048-bit key d=hendricks.nu (I recently moved off the default *.gappssmtp.com > signing in case that was a contributing factor), DMARC p=reject with full > alignment. mail-tester.com scores 10/10. > - [email protected] now returns 550 5.1.1 recipient rejected. The mailbox > appears to have been decommissioned, presumably as part of the late-2024 > email platform conversion. > - I sent a delisting request to [email protected] a day or two ago (from > Gmail, with full bounce details, auth status, and remediation summary). No > bounce, no response yet. > - Re-tested sending from [email protected] to a non-existent charter.net > address. Still getting AUP#In-1010, confirming the sender-level block is > still active. > > The affected use case is genuinely personal. My dad sends to a handful of > Charter-subscriber recipients (family and friends) and his mail is being > silently dropped on their end. Not a bulk sender, not a marketing list, > nothing on any public RBL that I can find. > > Is there a currently-working contact path for sender delisting at > Charter/Spectrum that I'm missing? Or if anyone Charter-side is reading and > willing to take a quick look at hendricks.nu, I'd very much appreciate it. > > Thanks, > Kyle Hendricks > [email protected] > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop
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