What is Gmail Clipping?

What strategies does a prominent email marketer use to avoid having their autoresponder messages “clipped” by The Big G when a large percentage of their subscribers sign up with their Gmail addresses, while still using HTML emails?

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It seems like the user is experiencing issues with their autoresponder messages being “clipped” by Gmail. They are sending HTML emails, but even when they make the emails short and remove extra formatting, they still get clipped. They noticed that another prominent marketer in their niche does not have their emails clipped, even though their emails are longer and have more formatting. The user wants to know how they can avoid having their autoresponder messages clipped and if anyone knows how the other marketer is avoiding this.