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Why is there an alert telling me to change the subject of my email?

Last updated: July 18, 2016

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Product: HubSpot Marketing
Subscription: Basic, Professional, & Enterprise

Including "RE:" or "FW:" in a marketing email is against best practices and is very likely to trigger spam filters as well as upset your recipients. As a result, HubSpot Marketing emails will show an alert when you include "RE:" or "FW:" as text in your subject line and will display a message (as shown in the images below) advising you to remove this string of text before you send: