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Selecting the right infrastructure is fundamental to email delivery success, and <a href=https://npprteam.shop/en/articles/emails/choosing-an-smtp-provider-and-mail-infrastructure-pros-cons-hidden-limitations/>how to choose SMTP provider for email campaigns</a> has become increasingly complex as providers proliferate across the market. Most marketers face a critical decision: managed SMTP services, dedicated servers, or in-house infrastructure, each introducing distinct trade-offs in cost, reliability, and deliverability. This guide unpacks the hidden limitations often overlooked during selection, including reputation constraints, throttling policies, and compliance requirements that directly impact your sender score and inbox placement rates. Understanding these factors helps you avoid costly migrations and infrastructure rebuilds months after deployment. Whether you operate a small marketing team or manage enterprise-scale sending, knowing what to evaluate upfront ensures you choose infrastructure aligned with your growth trajectory.