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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.

Where to Edit Template Code

With Mailchimp's template language, you can code an email template right from your account. Learn how to add template images and find your template's HTML.

Translate the Mailchimp Embed Code

With Mailchimp, you can embed signup forms right on your site. Learn how to translate these forms using custom code.

Troubleshooting Test Email Delivery Failures

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

My email looks different in Outlook

If your email looks different in Outlook, it may have to do with the version of Outlook rendering the campaign. Get tips for fixing common issues in Outlook.

About the General Data Protection Regulation

The GDPR regulates how organizations process the personal data of EU citizens, including organizations located outside of the EU.

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.