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MerlonixAug 24, 2026 • 6 min read
SPF, DKIM, and DMARC: Why “Valid” Records Still Let Your Domain Be Spoofed
Having SPF, DKIM, and DMARC records is the easy half. Whether they actually stop a forged email is d...
#security#devops#webdev#email
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Greg Pabijan-MorawskiAug 21, 2026 • 12 min read
SPF, DKIM and DMARC, explained by someone who had to make it work
I build a transactional email API, which means I have spent an unreasonable amount of my life readin...
#webdev#devops#email#node
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TobiasHawkins9231Aug 21, 2026 • 7 min read
What I Learned Sending Node.js Signup Notifications: Email and SMS Need Evidence
Short answer: put each signup verification request in a transactional outbox, let a queue worker...
#node#email#sms
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Petr Michal6d ago • 4 min read
The SPF redirect trap: why -all can make redirect= useless
A subtle SPF configuration mistake can cause redirect= to never run. Here is how SPF evaluates redir...
#email#dns#security#devops
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SaxonFletcher2366Aug 22, 2026 • 7 min read
Compliance Welcome Email: API Templates, Domain Verification, and Audit Retrieval
Short answer: For a fintech compliance welcome email, keep the regulated template and audit record i...
#email#fintech#observability
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ValerianBlack3895Aug 21, 2026 • 6 min read
Healthtech SaaS Bounce Suppression in Node.js: Transactional Email, DKIM, SPF
Password reset mail is an authentication dependency, not a marketing message. In a healthtech SaaS, ...
#node#email#saas
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Petr MichalAug 19, 2026 • 4 min read
How BIMI Inspection Actually Works: DNS Records, Selectors, SVG Logos and DMARC
A practical walkthrough of BIMI DNS records, selectors, logo locations, SVG requirements, and the DM...
#email#dns#security#devops
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Rivenor85Aug 21, 2026 • 6 min read
Seller Notification Evidence — Transactional Email API and Domain Verification
Short answer: choose a transactional email API by the evidence it can preserve for each marketplace....
#email#node#compliance
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ValerianBlack3895Aug 25, 2026 • 6 min read
Implementing Account Recovery Email: Next.js API Route, Custom HTML, and Suppression Checks
Short answer: keep password reset logic in the Node.js backend, put suppression and email submission...
#node#email#security
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EphraimPierce7934Aug 20, 2026 • 8 min read
Capacity Planning SMS OTP and Email 2FA (For US/EU Student Report Releases)
Short answer: choose SMS OTP or an email verification code for login 2FA by modeling the...
#security#email#sms
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HadleyFox8439Aug 20, 2026 • 8 min read
Debugging 4 Password Reset Email Failures (Requests, Domains, Templates, Payloads)
A password reset email is not complete when an API accepts a request. It is complete when the system...
#email#debugging#security
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FrostY45Aug 21, 2026 • 7 min read
Custom Domain Verification, DKIM Rotation, and Suppression for Transactional Email APIs
Short answer: Choose a transactional email API only after its custom domain verification, DKIM...
#email#deliverability#startup
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Kaelvyn47Aug 20, 2026 • 7 min read
Node.js Welcome Flow Explained — Custom-Domain Email API Suppression, DKIM, Polling
Short answer: for a healthtech marketplace seller alert, choose an email API with custom-domain DKIM...
#email#node#architecture
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MerlonixAug 24, 2026 • 5 min read
Is My Domain Blacklisted? Why a Public DNSBL Check Can Show a False Positive
Originally published on the Merlonix blog. A DNS blocklist (DNSBL, sometimes RBL) is a published...
#security#devops#webdev#email
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marcorossi4891Aug 23, 2026 • 6 min read
Healthtech Welcome Email — 4 API Signals Before Raising Dedicated-Domain Volume
The hard part of a healthtech signup email isn't calling a send API. It's proving that a dedicated.....
#email#deliverability#backend
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EmersonPrice3718Aug 21, 2026 • 6 min read
Clinical Password Reset Proof — Simple API-First Email, No SMTP, Bounded Cost
A healthtech password reset email implementation is constrained by the evidence its API must leave.....
#security#email#architecture
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MagnusNilsson21245d ago • 6 min read
Email API Demystified: Own Welcome Templates, Suppression List, Report Files
Short answer: for customer-support reports, choose a transactional email service that can own...
#email#architecture#backend
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HoldenFox84766d ago • 7 min read
Should a SaaS Password Recovery Flow Use Email API or SMS OTP?
Short answer: use an emailed, single-use reset link as the default for most SaaS login recovery, and...
#saas#authentication#email#sms
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MerrickVance8452Aug 24, 2026 • 6 min read
Transactional Welcome Email API: Provider Templates Beat Custom-Domain Repository Setup
Short answer: for a Node.js logistics portal, use an API-based transactional welcome or...
#email#dkim#sre
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HoldenFox8476Aug 24, 2026 • 8 min read
Python Multi-Channel Retry Logic: Auditable Delayed Status Polling for Gaming Notices
Short answer: send the gaming compliance notice by email, poll its delivery state on a schedule, and...
#python#backend#email
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oskarholm4968Aug 19, 2026 • 7 min read
Transactional Email Warmup Explained — 5 Steps for Deliverability and Volume Ramping
Short answer: use a dedicated sending domain, let real transactional demand set the pace of a gradua...
#email#deliverability#backend
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mT41Gzp73rc6Aug 19, 2026 • 7 min read
Reliable Password Reset Email Retries After 429 Responses (Without Duplicate Storms)
Short answer: treat an email API 429 as backpressure, keep one durable delivery job per...
#email#security#backend
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LiraelVex6403Aug 22, 2026 • 6 min read
Email Notifications: 4 Controls for DKIM, Suppression, Bounce Handling, and Polling
Short answer: For a Node.js email deliverability setup that sends product event notifications in the...
#email#sre#deliverability
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GideonSterling9643Aug 24, 2026 • 5 min read
Compare Transactional Event Notification APIs for US/EU Email and SMS Notices
Short answer: for a B2B SaaS compliance notice, choose the email and SMS API that makes an auditable...
#email#sms#node#compliance
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