Mac Mail Problem. PLEASE HELP!

I posted this on the Apple site with no luck, so I am hoping someone here could share some of their expertise with me. Thanks in advance for ANY help.

About a week ago I attempted to send an email to someone with an attachment that was very large (50MB or more) without my realizing how big it was at the time. Once I saw my mistake, I tried to cancel the sending of it in the Mail Activity pane in the bottom left of my screen.

After several unsuccessful attempts to cancel it, I quit mail and took my account offline with the drop down menu from the menu bar. I then deleted it when it went into my drafts folder and emptied my trash.

Since doing that, I am unable to to get any new mail when opening Mac Mail from the dock and the progress bar in the Mail Activity pane does not even seem to look for new mail the way it used to before. When I quit the application I get the following message:

"Some actions taken while the account "my name" was offline could not be completed online.
Mail has undone actions on some messages so that you can redo the actions while online.
Additional information: Operation could not be completed. (MFMessageErrorDomain error 1028.)"

I am able to check my mail online but would like help to see how I can fix the problem and view the mail as I am accustomed. ANY help would be greatly appreciated! Thanks!!!

 

Thank you for your help! I will try it when i get home from work and let you know if it fixed the problem.

 

Thanks!

that solution worked great. Thanks for your help.