My To: field breaks in Outlook.

When you create a campaign, you can select to Personalize the "To:" field on the Setup step of the Campaign Builder to display the recipient's name in the "To:" field rather than their email address. Outlook will almost always break the To: field if it's personalized and a subscriber doesn't have data for their first or last name.

If personalization is the culprit for your email showing as broken code in Outlook, you'll see one of two things in the To: field—quotation marks (" ") followed by the email address, or =?utf-8?Q??=.

To prevent this from happening, uncheck the Personalize the "To:" field box on the Setup step of the Campaign Builder.

Click Here to Personalize To Field

Any campaigns that are sent out with personalization turned off will display only the recipient's email address in the To: field.

If you want to enable personalization for the To: field but don't have first and/or last name values captured for every subscriber, you can set a default merge tag value to populate as a placeholder for missing information.

For further possibilities on why your email may be displaying as broken code check out this article.

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