My mail program on my macbook pro suddenly won't let me send e-mails?

My mail program on my macbook pro suddenly won't let me send e-mails even though I can receive e-mails. I have checked with the connection doctor and it shows me everything is fine. The program haas been running perfectly fine for the last year, but now its bugging out. Can anyone give me any tipe on how to fix this? Thank you.

The problem is one of the following:
Your SMTP server is provided by a carrier which only allows the outgoing mail server to be used when you are connected to their network. Receiving emails will always work, but sending emails will only work when you are connected via their connection;
Your SMTP server is down - contact your email provider

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