Spam is defined as unsolicited mass email to persons with whom you do not have a business relationship and have not opted-in to your mailing. Flashissue is for marketers who have an established list of permission-based opt-in email addresses or for those who are sending Newsletters to their own personal contacts through Gmail.
If you are sending unsolicited emails to people there's a good chance that your emails will go to spam. Even genuine emails may sometime end up in the Spam folder.
Here's a good blog post on understanding spam and how to reduce the chances of your emails being considered spam: