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emails being rejected

Jamie WW3S
 

Noticed a major drop in emails received, probably around 10/3. Posted a question or two, and never saw a response, so with to groups.io, and sure enough, there is plenty of mail there, but its not being forwarded to me If I check my bounce history, I see this:

550 5.7.1 [C15] RBL restriction: Blacklisted by Internal Reputation Service - 66.175.222.12

looks like Syancor is blocking the groups.io domain, not sure why, or more importantly, how does it get fixed?