My Mac mail has stopped sending email.

I have changed the password, restarted, and looked for new updates. Nothing has helped. I can't even send a plain text email. I have no problems receiveing mail, or send and receiving through my browser or my phone. The outgoing mail just sits in the outbox and does nothing.
Anyone else had the same issue and resolved it?

BASICS Send & Receive
1.  If you can send but not receive you have a bad POP or IMAP configuration (Incoming server)
2.  If you can receive but not send then you have a bad SMTP configuration (Outgoing server)
EDIT SMTP SETTINGS
In Accounts window, select to Edit SMTP Server list...
Select account in the list.
Click on Advanced tab. Enter full email address and password
Open Connection Doctor under Window in the Menu bar.
Do you see green light for SMTP for your account?
It's not uncommon to find extra SMTP servers listed. When you remove account, Mail does not delete the smtp info. You might need to do some clean up.
If you still have problems....
What email provider? (iCloud, Gmail, Yahoo, AOL, Earthlink, Comcast, ATT, other)
If other please identity provider.

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