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About Email Firewalls

Email firewalls are like spam filters, which contain or filter malicious content through a security appliance or server.

Troubleshooting Test Email Delivery Failures

There are a few reasons you might not receive test campaigns, including spam filters or firewalls.

Add a Signup Form in WordPress

There are several ways to add a Mailchimp signup form to your WordPress site. Learn which signup form works best with your site.

Troubleshoot Broken Links

Sometimes your email campaign may include broken or misdirected links. Learn some common causes for this behavior and how to prevent them.

Use Safe Sender Lists to Stay out of Spam Folders

Learn how subscribers can keep your Mailchimp email campaign from mistakenly being marked as spam or junk.

I know this email address is valid, but it hard bounced

Valid email addresses can hard bounce for many reasons. Reading bounce headers (SMTP replies) can provide insight on what caused an address to hard bounce.