Are you surprised?
Because if you actually sent more than 10 or so messages then I’m not, - that’s a temper tantrum not a complaint.
I doubt that it was actually 100 times, but it was no doubt enough to raise “possible spanmer’ or even 'potential DDoS attempt” flags at any mail server.
Many people are disappointed at CCleaner 7 - what makes you think that you are special and more entitled than others to any special treatment?
Could I suggest that you CALM DOWN and do what thousands of others have already done and roll back to CCleaner v6.39.
For the download link(s) and roll back instructions click this: [How to Roll Back from v7 to v6.39](How to Roll Back from v7 to v6.39
And then like the rest of us wait for developments.
