Attachment - A file which is attached to, and then sent along with, an email message

Attachment - A file which is attached to, and then sent along with, an email message. Any kind of file can be attached - text, graphics, sound, for example -but some attachments are too large to be accepted by the service provider. As most viruses are spread using attachments, using them in email marketing is not advisable, as recipients will be reluctant to open them and worse, assume the email is malicious.