Apple Mail just stopped being able to send mail?

No settings have changed. Worked fine a couple days ago. Yesterday, I noticed Mail getting extremely slow about sending mail, now it will not at all.
Plus, I am not being prompted to enter my password. I think this is the issue, but how can I force Mail to prompt me for the password when it used to do it automatically?
I use the Mail app for work and can no longer use it at all.

Not much to go on here, and why would you need to be repeatedly prompted to enter any password?
Who is the provider of the SMTP you are using as the Outgoing Server, and what Port are you presenting it on, and with what type of Authentication, if any?
Ernie

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