There are many reasons that mailbox providers could flag your email as spam.
Here are the most common reasons we see and how to fix them!
Sending From a Public Domain
If you send messages from a free domain like gmail.com, yahoo.com, etc., your messages will likely go to the spam folder. Make sure to send mail from a domain you own that matches your branding.
If the domain you send mail to has a DMARC policy, but you have yet to verify the domain with your SMTP provider, your messages will likely go to spam. Check with your SMTP provider for instructions on how to ensure your HighLevel messages pass DMARC.
Read the entire blog post at https://clickitemail.com/why-are-my-emails-going-to-spam.