IP has been blacklisted by over 100 DNS spam filters, then you should check out the site www.myiptest.com.
You will be able to check your IP to see if it has been put on a blacklist, you can now see why your emails have been going to spam filters. Even if your not sending spam you may be put on one of these lists, as it is done all automatically by the servers and if it thinks you are sending spam then you can be sure to find yourself added onto this list.
Most residential and Cable/DSL connections are blacklisted this is why it’s important not to send out your mass emails using that connection. You should be using your ISP connection for sending these out.
This site has many other tools also you can check out, many are fun to try out and use. You can do IP tracking, traces, and many other cool features. If you’re wondering how to check to see if your IP has been blacklisted it is very easy to do, just put your IP into a URL form and check the databases against your mail server IP. If it’s in the database then you have been blacklisted by that spam bot.
If you are blacklisted there is other ways to go about getting your emails out of the junk folder, this will involve changing or hiding your IP. Some areas you won’t be able to do this though, and you will be stuck sending the mail to junk folders. Using proxy servers is another way to go about getting to sites where your IP has been blacklisted, you will be able to do anything you normally would be able too, but you will need a new account.
Example of blacklist check:

Blacklist IP check example
Tags: blacklist, check, DNSBL, IP blacklisted, URIBL
