Why am I not able to attach files to my outgoing emails?

1. Verify if your email application is up to date
2. Check if you have enough storage space in your email account
3. Check the size of the attachment to make sure it's not too big for your email program
4. Restart your computer and try again
5. Check if the email application is configured with the correct settings
6. If you are using a firewall, make sure the port number it uses is open