How do I stop transactional emails from going to Gmail’s “Promotions” tab?

Preventing promotions tab placement requires stripping marketing links, buttons, and images from your transactional emails, keeping the focus strictly on plain text order updates.

“This tends to happen when transactional emails carry marketing links or images that make Gmail file them as promotional. I’ll strip those out and have them landing in the inbox within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions