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Question: Can't send messages after upgrading to high Sierra but I can receive them

I can't send messages after upgrading to high Sierra on my iMac but I can receive them. I immediately get a red exclamation point and it say not delivered -

iMac (Retina 4K, 21.5-inch, 2017), 10.13.1

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Nov 16, 2017 12:07 PM in response to lisasullie In response to lisasullie

Does this issue only happen with the Mail app or with using a web browser email client as well? Also, does this issue happen with just one email provider or all email providers?


Have you tried using the built-in Mail Connection Doctor? If so, what was the results?

Nov 16, 2017 12:07 PM

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Nov 16, 2017 1:28 PM in response to lisasullie In response to lisasullie

Sorry, I assumed you were referring to emails.


See if any of the following articles can help:

Nov 16, 2017 1:28 PM

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Nov 17, 2017 10:36 AM in response to lisasullie In response to lisasullie

I ended up on live chat with an apple tech. They had me reset the Nvram by shutting down and then starting up holding down the control - command - p - r keys. It did the trick.

Nov 17, 2017 10:36 AM

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Question: Can't send messages after upgrading to high Sierra but I can receive them