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3 of my ISP emails are getting no mail, the 4th a gmail account work fine

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Qmavam
Qmavam
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I have 2 emails provided by my ISP (knology), I have received no emails since 7:30 on 12/5, the are on the webmail site. The other 2 emails are gmail accounts they are working fine. I am getting a message, "The certificate for imap.knology.net is not valid for that server. Someone could be impersonating the server, you should not continue." 

 The fact that the gmails work and knology does not work is a clue but I don't know what it means.

I have contacted my ISP and after 45 minutes they gave up and said they will escalate and get back to me, 

with in a couple days! it was on a Saturday.
                                                         Thank you, Mike
I have 2 emails provided by my ISP (knology), I have received no emails since 7:30 on 12/5, the are on the webmail site. The other 2 emails are gmail accounts they are working fine. I am getting a message, "The certificate for imap.knology.net is not valid for that server. Someone could be impersonating the server, you should not continue." The fact that the gmails work and knology does not work is a clue but I don't know what it means. I have contacted my ISP and after 45 minutes they gave up and said they will escalate and get back to me, with in a couple days! it was on a Saturday. Thank you, Mike

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