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Curated developer articles, tutorials, and guides — auto-updated hourly
Hayrullah Kar4d ago • 7 min read
MailApp's Daily Limit Counts Recipients: Routing Sheet Email Between MailApp and a Provider
A Google Sheet that sends email usually ends up with two senders. MailApp for internal alerts,...
#magesheet#googlesheets#appsscript#email
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HermesOct 16, 2026 • 5 min read
The handler you assumed existed
The handler you assumed existed We were wiring up a lead pipeline: webhooks in, an agent...
#webhooks#devops#email
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Vishal Chauhan3d ago • 8 min read
How to Get Your App's Signup and Password Reset Emails Out of Spam: A 7-Step Fix for Beginners
You built the app with Cursor, Lovable, Bolt or Claude Code. Signup works. You tested it five times....
#supabase#email#beginners#vibecoding
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Ren4d ago • 6 min read
Writing a TNEF parser so winmail.dat never leaves the browser
Every winmail.dat converter wanted an upload, so I parsed TNEF in TypeScript, in the browser. Here a...
#typescript#webdev#email#privacy
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Hermes1d ago • 5 min read
The unsubscribe that never unsubscribed
The unsubscribe that never unsubscribed A customer filed a spam complaint against one of...
#email#compliance#reliability#devops
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Daniel PertuOct 16, 2026 • 4 min read
Two functions decide what to call you, and they disagree on purpose
The dashboard greeting falls back to the local part of your email address. The email greeting refuse...
#typescript#webdev#ux#email
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Odinaka Robert Nnamani4d ago • 1 min read
Your SES failover will never fire — and that's the point
A practitioner running 50k emails/day on SES told me his Postmark failover only triggers on SES...
#aws#email#devops#tutorial
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Odinaka Robert Nnamani1d ago • 4 min read
One tenant's bad list is spending your SES reputation
One tenant's bad list is spending your SES reputation If you run a multi-tenant SaaS on...
#aws#email#saas#backend
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Mogley10113d ago • 2 min read
Gmail 550 5.7.26 "unauthenticated sender": what it means and how to fix it
If Gmail bounced your message with 550 5.7.26 This message does not have authentication information....
#email#dns#devops#security
1 1
Vishal Chauhan2d ago • 9 min read
How to Set Up Onboarding Emails That Bring New Users Back: A 7-Step Beginner Guide for Your First SaaS
Someone signs up for your app. They click around for two minutes, get distracted, and never come...
#saas#startup#email#beginners
1 1
Stéphane Mugisho 4d ago • 3 min read
I'm adding two approvals before a Dolibarr mass mailing can be sent
I contribute to Dolibarr, the open-source ERP and CRM. I am working on this now, on issue #41892: a....
#php#opensource#email#tutorial
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Steve3d ago • 2 min read
One bad tenant can sink your whole email platform: what I learned building a reputation circuit breaker
I'm a solo founder in the UK building SentriSend, a security gateway that sits in front of...
#email#security#saas#webdev
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Daniel PertuOct 16, 2026 • 5 min read
Six HTML emails, five plain-text twins, and the one without a twin carries the activation code
Nested tables, inline styles, a card chrome pasted six times, an escape function that handles exactl...
#email#typescript#webdev#node
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Alessio Oct 16, 2026 • 5 min read
Test Emails Locally Without Sending Them: a One-File Python SMTP Sandbox with a JSON API
Catch every email your app sends in dev and CI with a one-file Python SMTP sink: web inbox, JSON API...
#email#testing#smtp#devops
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Andrej Mihaliak4d ago • 4 min read
Campaigns for Laravel — send one message to many recipients on queued job batches
Most apps grow a "send this to everyone" button sooner or later: a product announcement, a policy...
#laravel#php#showdev#email
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MailValid.ioOct 16, 2026 • 6 min read
Handling Bounces and Spam Traps in Code: What the Standards and Spamhaus Say
Disclosure: I work on MailValid, an email verification service. It appears in one section below, and...
#webdev#email#backend#security
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Abhishek Rajpurohit2d ago • 4 min read
Why Your Emails Land in Spam: A Teardown for People Who Aren't Developers
No SPF/DKIM/DMARC jargon here — just a plain-English walk through why an email you sent from your ow...
#email#dns#security#webdev
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Sam3d ago • 4 min read
SPF Records: Why Your 10 DNS Lookups Break (And The Fix)
Your SPF record is a lie. Not because you wrote it wrong. But because the guest list you published....
#email#dns#security#devops
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Lalit Kumar Jangid1d ago • 4 min read
Which emails should an unsubscribe stop? A suppression rulebook for your app
Unsubscribes, bounces and spam complaints mean different things. Here's which emails each one should...
#email#webdev#api#discuss
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Nazma Akter3d ago • 5 min read
AI cold outreach with guardrails: how Reach drafts, sends and stops (in Go)
An LLM can write a cold email in a second. That's exactly the problem: it will just as quickly inven...
#go#ai#email#webdev
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Ujjwal Dubey2d ago • 2 min read
Count Before You Automate: Tallying Repeated Request Types From an Inbox Export in Python
Every automation conversation eventually hits the question "how often does this actually happen?"...
#python#automation#email#smallbusiness
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Damiana Teliti1d ago • 3 min read
Why catch-all email addresses can't be verified (and what to do instead)
If you've ever run a list through an email verifier, you've probably seen a result labelled...
#email#webdev#marketing#saas
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Lalit Kumar Jangid2d ago • 5 min read
Transactional email checklist: 8 things to get right before your app sends a password reset
Most apps send their first transactional email the same way: a developer adds a "Forgot password"...
#email#api#ai#discuss
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Jonas Birmé5d ago • 5 min read
End-to-end tests that read real email, without a disposable-inbox service
If your signup flow mails a login code, your e2e suite needs a real inbox. Here is how we replaced a...
#testing#playwright#opensource#email
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