Cannot send email from 3 accounts Mac Pro

My brand new Mac Pro cannot send email using Gmail, Shaw, or iCloud.  At times I can send a simple test message, other times I cannot send.  It seems the more data in the email, it for sure cannot be sent.  The sent messages get stuck in the Out Box.  Full green lights, no red lights in the connection diagnostics window.  Any help in this regard will be much appreciated.

thank you for your reply, I did this with the same problem.  Turns out that I went to FAQ section and went to the "Sharing" section of "system preferences"  and changed my computer name by removing all spaces and apostrophe where it lists my computer name under Mac Book Pro, and problem solved.

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  • I can no longer send emails from my mac yahoo business account, but can send them directly from yahoo. just not from mac mail. I've been able to send emails perfectly fine until today. Help!

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    I have been having the same problems for the last two days now.  It won't let me send, but it will let me save it to my drafts folder.  I even tried opening the e-mail form my iPhone 5 and it won't let me send it there either.  The last two times i ended up copying the contents from my failed e-mail on my phone and pasting that into a new e-mail and that works.  I normally use the icloud web app to reply to e-mails when i'm at work (using win 7) and it is very frustrating. 

  • Cannot send email from ipad?

    I can receive, but cannot send emails from my iPad. Always get message that I have wrong user name or password.

    Then make sure that the settings are correct in your email account.
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