Spam filters are fairly straightforward. There is a long list of factors emails are scored on. If the email’s score gets too high, it’s flagged as spam by the email server. Unfortunately, every server is different and constantly changing. So what’s marked as spam on one server might not be marked as spam on another. As a general rule, you’ll want to avoid:
According to data from Omnisend, welcome emails have an average open rate of 45%. Though the data varies, first purchase automation generally produces 3-6 times more sales compared to a regular promotional email. In addition, though a series of welcome emails may perform better than a single send, engagement drops off after the first email in the series.
To make sure everything is formatting correctly, click Send me a test email to receive a sample message. Toggle to Gmail and check the message. If everything looks good, return to that dialog box and click Send Emails. You’ll now see EMAIL_SENT next to each contact in the Merge Status column of your spreadsheet. If you want to perform another mail merge from that same spreadsheet, remember to delete that text from the Merge Status column of each recipient you want to email again. 
3. Your email newsletter subject line should be eye-catching yet straightforward, and should avoid spam words. Your email subject line is your first chance to connect with your subscribers. Of course you want subscribers to be intrigued, so you can say something like "The Five Things You Need to Know About Buying a Car" or "The Best Mac and Cheese Recipe Ever." Be careful not to include words like "Free" or "Cash" and don't put your title in ALL CAPITALS. You can see a more complete list of spam trigger words here. Studies have also found that mass email subject lines perform best with email subscribers when they are direct and truthful about what is in the email. Subscribers want to know what is in the email before they open it, so let them know in the subject line that there is a 25% off coupon for them inside.

Email has been shown to generate a better ROI compared to other marketing channels. A survey by the Direct Marketing Association and Demand Metric of marketers in the United States showed that email achieved a median ROI of 122%, which was more than 4 times higher than other marketing channels, including social media (28%), direct mail (27%), and paid search (25%). And in 2016, email marketing generated $44 ROI for every $1 spent, which was up from $38 in 2015. 
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