Optonline problems

I’m hearing from multiple sources that they’ve been having problems getting mail delivered to optonline.net, optonline.com and optimum.net all day. This appears to be affecting senders across the board, from ISPs to ESPs.
It looks like something is not working right over there, and hammering retries doesn’t seem to be helping. The best recommendation is for senders to back off overnight and test some sends tomorrow.

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