"I wanted to start a discussion around email deliverability as web projects begin to scale. Many of us start out using the default mail function provided by our hosting environment, and it often works fine at low volume. But as applications grow and email becomes more critical-account verification, password resets, notifications, onboarding flows-deliverability issues tend to surface. In my experience, the problems don't usually come from the code itself, but from how emails are sent and perceived by inbox providers."
"Even with correct SPF, DKIM, and DMARC, inbox placement can be inconsistent if sending patterns or infrastructure aren't aligned with best practices. One area I've been looking into is the role of an external SMTP Service Provider versus running mail directly from an app server. On paper, SMTP is simple, but in production it involves reputation management, rate limiting, retries, logging, and ongoing monitoring. A dedicated SMTP Server Provider often handles these aspects more reliably than a general-purpose web host, especially when email volume increases."
Many projects begin using hosting-provided mail functions which work at low volume but cause deliverability issues as applications scale. Problems usually stem from sending practices and infrastructure perception by inbox providers rather than application code. Correct SPF, DKIM, and DMARC are necessary but not sufficient; inconsistent inbox placement occurs when sending patterns or infrastructure do not follow best practices. External SMTP service providers offer reputation management, rate limiting, retries, logging, and monitoring that general-purpose hosts often lack. Consider separating transactional and promotional streams, monitor signals beyond bounces, and evaluate sending timing, batching, and frequency while balancing application simplicity with operational complexity.
Read at SitePoint Forums | Web Development & Design Community
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