Invoice emails going to spam/junk

So not sure what is wrong. So all of a sudden email invoices in gmail or hotmail are going to spam/junk. The email says:

Gmail could not verify that it actually came from THE SENDER. Avoid clicking links, downloading attachments, or replying with personal information.

So my site’s email is like [[email protected]](mailto:[email protected]) and that goes to junk. I then invested in a SMTP server and send all emails from the cart using SMTP service and then I have SPF records in my DNS settings but I still get junk/spam warnings. What can I do?

submitted by /u/kassius79
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