my email app is glitching when I open it up

Safe Boot from the HD, (holding Shift key down at startup), does the problem occur in Safe Mode?

Safe mode attempts to repair Disks & clears lots of caches, so if Safe Mode works try again in regular boot.

If still no good Disconnect from the Internet, then start Mail, look for the last rec'd eMail.

Does Mail crash if no internet?

Quit Mail & login to your WebMail in a Browser, if possible delete any later eMails there after the last rec'd one on the Mac.

mbdivalish wrote: "I usually close all my apps and sites and have nothing on my screen then I just close the screen. so is that safe mode?"

See this Apple Support Article:

How to use safe mode on your Mac

...found by searching Apple's Knowledge Base.

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Safe mode attempts to repair Disks & clears lots of caches, & prevents 3rd party extensions from loading, so if Safe Mode works try again in regular boot.

Quit Mail, in a Browser login to your WebMail, is that file you tried to send there & can be deleted?

Back on the Mac, disconnect from the Internet, OpenMail App & wait for it to time out if it's still trying to send it, should pop up a message saying can't send... try later or edit... choose edit & delete it.

Force close the app and restart your device until the Apple logo appears