

Read our guide on how spam filters think to see if anything mentioned there sticks out about your content. If a "Hi, how's it going?" type of personal message gets through, but your normal email campaign doesn't, it's likely an issue with the campaign's content. If the email address is someone you know, use the Send a Test email from Mailchimp-just send a quick, plain-text email to a single recipient.
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Common SMTP replies for spam filtered emails include Denied, Unacceptable Content, Blocked, and similar messages. Spam filters can be on the recipient's computer, on their company's email firewall, at their ISP/Data center, or all of the above. If your email was blocked, a spam filter may have interpreted the campaign content as spam. Reasons valid addresses bounce Denied by Firewall or Filter In this article, you'll learn common reasons a valid email address could bounce. If the cleaned email address is still valid and the contact wants to resubscribe to your audience, they need to sign up through your signup form to opt back in.

Learn to read bounce headers (SMTP replies) to get some insight on what caused an address to hard bounce.Īfter an email bounces, it goes to the cleaned portion of your audience. Valid email addresses can hard bounce for many reasons.
