The difficult part of marketplace event notifications is not choosing an email or SMS API. It is deciding who owns the sentence that a support agent receives, and proving that the sentence matched the routing decision. I keep the contact-form…
Short answer: retry failed email API calls only for approved transient outcomes, using a five-attempt ceiling, a 2-second exponential base capped at 32 seconds, and an audit record; suppress or review an invalid marketplace recipient instead of retrying it. That distinction…
Short answer: Use bounded exponential backoff with Retry-After for 429 email errors, and choose a shared REST transport when reducing provider integration friction matters more than specialist email controls. To handle 429 rate limit errors in a Node.js email API, retry…
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Email verification looks simple: send a link, wait for a click, mark the address as confirmed. In a real product, it is an authentication boundary. It can change account recovery options, unlock paid features, and give an attacker a useful…
Receivers silently ignore a malformed DMARC record. Common culprits: You should see exactly one line starting "v=DMARC1;". Without it, compliant receivers drop the report. This is the most common reason third-party report inboxes stay empty. Aggregate reports arrive as zipped…
If you're building any tool that sends email — whether it's transactional notifications, marketing campaigns, or cold outreach — deliverability is the invisible layer that determines whether your emails actually reach inboxes. Here's a practical checklist for developers who want to get…
Marketers write the trigger in one sentence. Mailazy sends the email when a user does something, or stops, and shows whether it worked. The problem: users get stuck, and the email arrives on the wrong day Most lifecycle emails still…
Not sure if a police call is legit? From Monday (Nov 2), all outgoing calls from the Singapore Police Force (SPF) will use the single caller ID number, 6000 0999, to help the public distinguish legitimate police calls from scams. Each call will…
DKIM/SPF/DMARC, spam filtering, warmed IPs, and content/reputation signals.
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