Is all-caps forbidden?

Myth: False. All caps is not forbidden. Limited use for emphasis is normal and acceptable. ENTIRE MESSAGES IN CAPS might look spammy and annoy recipients, but that affects engagement more than filtering.

The concern is user experience rather than filter triggers. Caps can feel like shouting. Readers may react negatively, affecting engagement metrics that do influence deliverability.

Use caps sparingly for emphasis where appropriate. Avoid full message caps that create poor reading experience. The filter concern is overblown; the UX concern is real.

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