Can no longer send email from my accounts but can receive

I have 5 email accounts set up on my imac. 3 are mine 2 are my partners. I can no longer send emails from my accounts but my partner still can. They all still receive mail but when I attempt to send mail I get:-
Cannot Send Message Using Server
Then i'm asked to select a different server from a list. I have tried all but to no avail.
I first of all deleted my partners sky.com account because it appeared to me that this was maybe overiding all other accounts and it was no longer needed on imac.
I then deleted one of my accounts - hotmail, to see if i added it again maybe it would work but now I cant even re add the mail account as everytime i go to mail, preferences account to set it up again the initial screen comes up with my partners details including the sky.com username and when i overwrite these and try to install hotmail acount I get told that logging in failed check user name and password is correct. Which they are.
All used to work fine but now I have these problems, they appeared to have started when my partner set up an icloud account and is synching with this - could this be the cause?
I can send email from my accounts from iphone still but no longer from imac.

First,
I'd run all availiable software updates. After that, I would try removing all of the accounts from "Mail", and then re-adding them. Be aware that if your folders and such are located on your mac, and not on the mail servers, you may risk lose some information (always have a back-up).
Sometimes, when you have a number of e-mail account there can be server issues abound. I would go into the server lists and make sure that they are set properly. If you see the "use only this server" box, check it for each of them.

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