Tagged: SMTP relay
SMTP & InfrastructureTransactional email has fundamentally different infrastructure requirements from marketing campaigns — it needs to be fast, reliable, and completely isolated from anything that could drag down its deliverability. This guide covers the architecture decisions that matter: queue design, authentication, suppression lists, monitoring, and how to test before you go live.
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SMTP & InfrastructureEmail webhooks give your systems real-time visibility into deliveries, bounces, complaints, and unsubscribes — without polling. Here's how they work, how to build a reliable endpoint, and what to do with each event type.
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SMTP & InfrastructureTransactional email — password resets, receipts, alerts, two-factor codes — is business-critical infrastructure. Here's how to design a reliable, scalable sending setup that handles growth without dropping messages or hurting reputation.
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Email OperationsMost SLAs get read for the first time during an outage. Here's what email service level agreements actually cover, why the uptime percentage matters less than it sounds, and what to check before you sign.
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SMTP & InfrastructureThe SMTP queue is invisible when everything works and critical when it does not. This guide covers connection concurrency, retry backoff strategy, message prioritization, queue depth monitoring, and when to scale horizontally to keep email throughput high and latency low.
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SMTP & InfrastructureEmail webhooks push delivery event data — bounces, complaints, opens, clicks, unsubscribes — to your application in real time the moment they occur. This guide explains how webhooks work, how to secure your endpoints with HMAC signature verification, and how to use them to keep suppression lists current automatically.
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SMTP & InfrastructureAn unsecured SMTP relay is a direct path to spam abuse, blacklisting, and legal liability. Use this checklist to audit and harden your SMTP relay configuration before a problem forces your hand.
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