Sendloop strongly discourages attaching files to emails for the following reasons:

• Users perceive attachments negatively due to the risks associated with opening unknown files.
• Your emails are more likely to be flagged as spam and not delivered.
• Attachments increase the size of your email, which means that it takes longer to send.
• Users have to download a larger file, which negatively impacts your conversion rates.

If you want to send a file to your recipients, Sendloop recommends uploading it to a web-accessible storage service (such as Dropbox) and including the link in the body of the email.