Confidential Research

    Email Deliverability Audit:
    Marketing Pro Email

    An independent technical analysis of the email infrastructure powering one of the industry's most popular marketing tools.

    Overall GradeD+

    Key Findings

    • Shared-domain, shared-IP architecture on Twilio SendGrid's shared pool tier
    • Zero contractor control over authentication, domain reputation, or sending infrastructure
    • Emails routinely landing in spam for contractors paying $1,000–$3,000/month

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