Do you have a document or set of documents that you need to attach to a particular email?
ServiceM8 makes this easy with their attachment option on Email Templates.
You may have insurance documents you need to send with a work confirmation email, or terms and conditions you want to send with a quote email.
To use this feature, go to Account > Settings > Email Templates > Edit Email Template > Attachment > New Attachment
Extra tip – try to make sure your attached files are as small (filesize) as possible, so that your email will still send successfully.
Are you using this feature? What do you send along with your emails?