I wanted to share something I found when working a Gmail spam folder issue when using Gravity Forms notifications. My customers notification Gmail address recipient was seeing those Gravity Form notifications going into his spam folder. I duplicated the results using my Gmail account. I should note we use Postmark to ensure delivery. Gmail will accept these notifications but then Gmail does it's internal spam weighting is almost kills it. Having a message going into a spam folder hurts the reputation of the sender. The fix: Ensure every html notification includes the HTML container code at the top of the e-mail and bottom. Spammers often fail to write complete code and will get caught.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>Confirmed Move from {Name: (First):23.3} {Name: (Last):23.6}</title>
</head>
<body>Normal Gravity Form content
</body>
</html>Native Gravity Notification Forms lacked the essential HTML container code.
The fix is simple although manual.