New member with same problem, although I run a dedicated server, and clients NOT using CC are having this problem too. I'm in the Time Warner (Spectrum) service area of western Ohio (woh.rr.com). Does anyone have the headers from the bounce messages that might shed some light on this problem? All mine contain this phrase: R=dkim_lookuphost T=dkim_remote_smtp: all hosts for 'woh.rr.com' have been failing for a long time (and retry time not reached)
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