Follow the guidelines below to help make sure your bulk mail gets classified correctly and delivered to Gmail recipients.

Note:

• If you get the error, "Message rejected by Google Groups", go to bulk senders guidelines for work or school accounts.
• If you're sending to an individual, learn how to fix bounced emails.

How Gmail classifies incoming mail

• Spam: Spam goes to the Spam folder; everything else goes to the inbox.
• Inbox categories: In Gmail's default inbox layout, messages are divided into the following categories:
  • Primary
  • Social
  • Promotions
  • Updates
  • Forums

Mail classifications automatically adjust to match users' preferences and actions. For example, users can unmark spam, move messages to a different category, or switch categories on or off. Over time, Gmail automatically adjusts classifications according to these corrections. Learn more about inbox categories. 

Step 1: Use Postmaster Tools

Postmaster Tools provides metrics on reputation, spam rate, feedback loop, and other parameters that can help you identify and fix delivery or spam filter issues.

Step 2: Make sure bulk mail gets classified correctly

• Send consistently from the same address for each mail category. For example, always send a promotional email from one address and financial transactions from another address.
• Avoid mixing different categories in one message. For example, if you include promotional content in an email with a financial transaction, Gmail could classify the email as promotional.

Step 3: Make sure bulk mail doesn't get marked as spam