If an email is delivered to the junk folder of an email client, we have found that this is typically because the junk/ spam filter that the recipient uses, or an intermediate mail server, has identified a combination of content or other settings of the email as junk or spam.
Things to try
Perform a spam analysis
Try conducting a simple spam test on your email.
Try a different 'From' address
Try changing the from / sender email address of your message to see if this immediately resolves the issue. It's possible that your spam filters are recognising that while the from address is set to your domain, it isn't actually coming from your servers and therefore identifying the message as potential spam.
Is your domain authenticated?
If your domain is not authenticated, some email servers will reject your email. Find out more about domain & email authentication.
Other things to try
- Alter the subject line.
- Scan the email for words that might seem spammy (such as references to money or anything 'free').
- If your email is image-heavy, try adding some text. A high image:text ratio can seem spammy to some spam filters.