Given the severity of the spam issue on the Internet, most major Internet Service Providers (ISP's) have established a base line set of criteria they use to determine if an email message is spam or not. If your mailing ever gets labeled as spam you can very likely end up not being able to send any email of any kind from that point forward that then goes to a recipient within that ISP's customer base.
Getting your domain or email address off of a spam blacklist can take months and an exhaustive amount of effort. So it's much better to avoid this happening in the first place.
Please contact us to learn more about the standard procedures and best practices for email marketing.