I'm not sure if this issue is because I've messed something up with my computer/gmail/outlook/mail but I cannot get email to send via any application installed on my computer. 

I started with Windows 10 Mail... worked great for a while but then every time I sent an email out, I'd get this response:

"We weren't able to send this message, so we've put it in your Drafts folder. Before you try sending it again, you can check to see if the address is correct and that no attachments are too large." 

The address is correct, and most emails have no attachment.  

So, I tried Outlook- it wouldn't send emails either. It would download my entire inbox just fine, but when I tried to send anything I would get this error:

 0x800ccc0f

I followed every recommended fix guide online to no avail, so I tried and went back to Win 10 Mail, made sure it was up to date, and sent a few emails. First handful went through just fine, and then the same message as above started happening again.  

If anyone has any advice to fix this I would really appreciate.