"I'm currently reviewing the email delivery setup for a web project that relies heavily on transactional and notification emails (account verification, password resets, order updates, etc.). Like many developers, I'm using an external SMTP Service Provider instead of the default mail function provided by the hosting environment. From what I've observed, having a technically correct setup (SPF, DKIM, DMARC, TLS) doesn't always guarantee consistent inbox placement."
"What are the most common mistakes developers make when integrating an SMTP Server Provider into production systems? How much difference have you seen between shared vs dedicated IPs in real-world use? Do you separate transactional and promotional emails at the SMTP level or handle them through the same pipeline? What metrics do you actively monitor to catch deliverability issues early (beyond basic bounce rates)?"
A web project relies on transactional and notification emails such as account verification, password resets, and order updates. An external SMTP service provider is used instead of the hosting environment's default mail function. Proper authentication (SPF, DKIM, DMARC, TLS) and domain warm-up do not guarantee consistent inbox placement. Deliverability fluctuates with recipient engagement, sending patterns, and underlying infrastructure quality. Common integration pitfalls include misconfigurations, insufficient IP reputation management, and mixing traffic types. Separating transactional and promotional streams and monitoring delivery metrics beyond bounces help detect problems early. Sending cadence, time, and batching materially affect inbox placement.
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