Cannot send messages in Mail

Apple Mail is my primary email client. Yesterday, it started behaving strangely. It now will not send messages, either new ones or replies. Instead of being sent and then stored in my "Sent" mailbox, they go to the "Outbox". Trouble is, the Outbox does not appear in the list of mailboxes, and is grayed out in the View -> Go To menu. The only reason I know that the messages are going to the Outbox is when I click on the small arrow that appears next to a message that I replied to, the title bar shows that it's in the Outbox. I'm unable to access the message by searching for it and unable to send the message through Mail.
Any help would be appreciated! I'll have to change email clients if I can't get this resolved soon, as I rely on Mail for my work at home.
Thank you!

Did you check the Outgoing Mail Server and Incoming Mail Server, along with the Ports used, and whether or not Authentication is used? If not, that's the first thing to do. If all of those things are okay, then it's possible that your Mail preferences have become corrupt, and there's only one way to fix that.
If that's the problem, here's how to fix it (or test to see if it's the problem):
1. Quit Mail and go to Home/Library/Preferences and remove the com.apple.mail.plist file to your Desktop.
2. Restart Mail and setup your account(s) again.
3. Wait for Mail to find your existing messages and then see if the problem continues. If not, then you know the file was corrupted and you can now delete the old com.apple.mail.plist file from your Desktop.
The Outbox isn't supposed to appear in the list of mailboxes, except when something is in the process of being sent, so that's not a problem. What is a problem is if messages go there but don't get sent. But you can access the message so that you can delete it if you choose by going to Home/Library/Mail/Mailboxes/Outbox.mbox.
Post back with results.

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  • Cannot send message using the server (null)

    i use mail 2.1.
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    We would want to make sure the mail settings are correct. I have sent you a private message to get more information.
    Anthony_VZ
    **If someones post has helped you, please acknowledge their assistance by clicking the red thumbs up button to give them Kudos. If you are the original poster and any response gave you your answer, please mark the post that had the answer as the solution**
    Notice: Content posted by Verizon employees is meant to be informational and does not supersede or change the Verizon Forums User Guidelines or Terms or Service, or your Customer Agreement Terms and Conditions or plan

  • Cannot Send Messages Using  the Server

    I am dependent (during the day) on a wireless connection to the Minneapolis Wi-Fi system (U.S. Wireless).
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