When your emails go to spam, most people think it is just about what is inside your email but that could not be farther from the truth. Getting your email moved into the spam box is not just about content. While your content could be the major contributor to you getting flagged as spam, just as equally to blame can be the platform you send out on and the domain you are using to send. To know why your emails go to spam requires a look at not only your email content but other factors as well.
Emails go to spam when an isp algorithm combines factors such as the source domain, ip blocks, email content and email construct to build a highly complex score that will put your email in the junk folder.
If your source domain has little, no or poor reputation, then the email recipient isp will tend to play it safe and will direct that your emails go to spam and leave it to the user to pull them out. Because of the nature of email, there are not many new domains that are legitimately sending email and isp’s know it so will banish your emails to the junk folder.
Another red flag that will send your emails to spam is when the ip used to send out your emails is from a block that is previously known to send out spam. Most bulk email senders are overseas and pay little attention to whether your emails make it into the inbox and could care less whether your emails go to spam. Make sure that the ip’s you use are clean and do not have an existing reputation that is bad.
Finally, the importance of email content and email construct cannot be ignored. Short emails with html will be flagged. Long emails in text only are flagged. Content and construct scoring change on a regular basis, so if you are going to email, you have to keep up with the rules and do it right.