Why can't I send mail in some accounts after El Capitan?

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Can't send mail in some accounts after El Capitan

I installed El Capitan, and now I can't send mail with some of my accounts. I get a message asking what server to use. The servers haven't changed, but the mail won't go.
 

Jaguarr40

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Jan 14, 2011
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Re: Can't send mail in some accounts after El Capitan

It must bean email that is not a well known or Apple would pick it up automatically. Check your SMTP mail server to make sure you are entering it right and that it has not changed.
 

Just_Me_D

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Jan 8, 2012
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Re: Can't send mail in some accounts after El Capitan

Check the mail account settings to make sure everything is set correctly.