You should know the answers to these questions before using attachments in E-mail.
Attachments are files such as word processing files or spreadsheet files.
Attachments are not really part of the E-mail message you are sending, but are attached to it. Attached files are not usually text files like the E-mail message itself, instead they are usually binary files with a specific internal format for a specific software and must be encoded before they are sent. Please note that incoming attachments will be located in a separate directory or file system then the Email. Only when necessary. Keep your recipient in mind when sending attached files.