There could be several reasons why you aren’t able to send emails with certain file types. To address this issue, the following steps can be taken:

1. Check the size of the file. Some email services have a limitation on the size of the file that can be sent.
2. Verify the type and extension of the file. Some email services do not allow files with certain types or extensions to be sent.
3. Check that the recipient’s email service allows the sending of files with that type or extension.
4. Compress the file. If the file size is too large, try compressing it into a .zip or .rar file.
5. Make sure that the file is virus-free. Many email services will not let you send files that contain viruses.