And of course, the more often you overcome spam filters, the more opportunity you have to close potential business.

Check out this list of common spam filter triggers to avoid:

1. A Free Email Address

Yes. Simply using a free email address from Gmail, Hotmail, Yahoo, AOL, or any other similar service greatly increases the chance email providers will mark your message as spam. You need only check your own personal spam folder to see where so many of these emails come from!

The lesser known the service, the greater the chance your email will go to spam. Thankfully, simply using an affordable company email account practically eliminates your odds of landing in a potential customer’s spam folder.

2. Any of These 394 Trigger Words

Email services scan every word in your email to help judge the chance that you’ve sent a spam message. The more trigger words you use, the greater the odds you’ll head to someone’s spam folder.

Some popular trigger words include 100% free, call, guarantee, win, won, get, cancel anytime, free, and many others.

HubSpot has compiled a list of 394 such trigger words, which is by no means a complete list as spammers try to bypass mail filters all the time using different language. Thus, email services constantly update their database with more words (and even symbols) to thwart them.

3. Your Reputation

Spam filters do calculate your reputation based on your domain name or IP address.

If you were flagged as spam in the past—even as an innocent party—you can still end up in someone’s spam folder.  Using a shared Internet connection, your connections rotates between several IPs versus a dedicated IP.  One or more of the shared IPs might be on a Blacklist.

First of all, find your IP via an IP Checker.   Then by using a Blacklist Checker, you can determine if your IP is Blacklisted by any one of more than 80 Blacklisting organizations.  If you are on the list, contact your carrier.

You’ve surely had to dig out someone’s legitimate email from your own spam folder on more than one occasion. As such, you know this is in fact possible.

4. Other Odds ‘n Ends

Spam filters evaluate oodles of information to determine the legitimacy of your email.

Poor grammar and spelling, including too many links, sending a message that’s just one image, font size too large or small, whether your recipients actually click on and read your email, and attachments (even legitimate ones) are some of many factors that can cause your email to land in someone’s spam folder—these are just some of the larger transgressions.

Don’t Let Spam Filters Scare You

Perhaps you now assume it’s extremely easy to get tossed into someone’s spam folder.

While it does happen from time to time, provided you have a legitimate message from a domain you own—not a free email service—that looks and sounds professional, you should be okay.

However, as with anything for your business, the more you optimize, the greater your profitability.