MAIL program cannot send new emails

I am using a 2016 iMac with Ventura 13.7.2. Before I updated my software yesterday , I noticed that I could not send any new emails. It looked like it would send, connection doctor said it logged in, I heard the send sound, but nothing shows up in my sent folder. I can reply to someone for forward, I just cannot send a new one out.

My ipad and Macbook are sending email with no problems and my iMac and Macbook have the exact same network settings except my Macbook uses Sonoma 14.5.

Can anyone help me out here so that I can once again send new emails on my iMac?

Thanks, Martha