Here’s a nice guide to stopping your meticulously-crafted emails from being wasted. 10 Tips to Avoid Email Spam Filters and Reach Your Subscribers’ Inbox on the Content Marketing Institute blog gives a series of steps to lower spam scores and improve email deliverability. They are:
1. Provide double opt-in
2. Maintain your IP reputation
3. Avoid trigger words or misleading subject lines
4. Ask your subscribers to add you
5. Send ‘value-packed content’
6. Forego attachments
7. Follow the law
8. Use proper text and image ratio
9. Avoid inactive subscribers
10. Use email checkers for spam scores
The article explains each step.