I have encountered the same problem with my Macbook Pro 2012 whilst away on 
holidays.

Very interested in the responses that may come in.

Regards

John Thompson


> On 27 Oct 2017, at 9:36 AM, Diana & Graham Stevens <diag...@iinet.net.au> 
> wrote:
> 
> Good morning all
> 
> Graham can't send emails from his POP account (no problem with incoming 
> mail). At first this fault was intermittent but for the last 2 days every 
> time he tried he got the same message "Can't connect to server ... enter 
> password" then "unable to verify ...".
> 
> In preferences the SMTP password wasn't filled in with "optional" showing. If 
> I filled in the password I couldn't save it because only one SMTP server is 
> allowed.
> 
> Because Graham needed to send an important email, I set up one of my email 
> addresses with his name and he sent it last night.
> 
> This morning I sent a test message from his account and it went. When I 
> looked at the preferences for his account my email address is in the SMTP box 
> and the password is now filled in. Gremlins?
> 
> I tried to change the SMTP to his account but got the same "only one allowed" 
> How can I fix this please.
> 
> iMac (Retina 4K, 21.5-inch, 2017) 3.4 GHz Intel Core i5 OS 10.12.6
> 
> Diana 
> 
> Sent from my iPad
> 
> 
> Sent from my iPad
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