Can't send email, but I can receive it.

I get the following error that just started on my iMac and my MacBook. Connections to the server “p38-smtp.mail.me.com” on the default ports timed out.

I have already been to the following pages with no luck. If you can’t send email on your Mac and learn how to resolve issues with iCloud Mail.

Neither of these was helpful. Can someone suggest something else? I don't think it is my isp because I am on my home wifi with no issues or changes, and the laptop is at my place of employment with the same issue. Just started happening a week ago.