My MacBook Pro can't send mail since Yosemite upgrade. I keep getting a message that the certificate is invalid, and it says that my account is "offline." This never happened before, very upset.

I upgraded to Yosemite yesterday afternoon on my MacBook Pro. It was an upgrade from the most recent Maverick version. I had already sent out several emails that day, but once the installation was complete, I couldn't send any mail at all. I kept getting this strange dialogue box that said the certificate for the server was invalid, and might be something "pretending" to be my server. It also keeps telling me that my email account is offline. The only account it shows as active is a Verizon POP account, but that doesn't work. I've tried using the Edit functions and the "doctor" functions, but they seem useless. I tried Help, but the instructions it gave included onscreen items I don't seem to have. This is awful, I've already missed deadlines and am desperate.

I have the same issue. My computer has also slowed down. I hope this isn't a malware. I haven't input my password into it, and dont know what I did to turn this on.
Hope someone else can give some insight

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Hey User13579,
Thanks for using Apple Support Communities.
Follow these steps to attempt to resolve the issue.
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http://support.apple.com/kb/TS4148
Toggle Airplane mode On and Off.
Try turning iPhone off and then on again.
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Restore the iPhone.
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Mario

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http://support.apple.com/kb/TS3899
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 Cheers, Tom

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Hi,
I just bought a 13 inch macbook pro, 750 gb hard drive I7 processor. I can receive mail, but can't send it through my verizon account. My mobile me account works fine. Everything looks right but it just won't send. Any ideas?
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