Attachment file does not exist.

This type of error is seen in the File Attachments field within the Mail tab when you set file path values there, but no file actually exists at the specified path.

A common pitfall is confusion between an absolute path and a relative path. If the first character of a file path is “/” it’s an absolute path. If not, it will be treated as a relative path to the ‘wp-content’ directory.

Just another contact form plugin for WordPress. Simple but flexible.