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Marketplace Alerts: 5 Transactional Email and SMTP Signals for 2FA Codes

Short answer: yes, an email API can replace the SMTP login used by your application for 2FA codes and generated marketplace reports. It does not rep…

Welcome Email Deliverability Problems in Transactional Onboarding and Bounce Handling

For a property-management contact form, keep queue routing and delayed welcome logic in the application, then use a transactional email provider for…

Transactional Email and SMS API: 5 SaaS Event Notification Evidence Tests

The transactional email and SMS API event notification page says dispatch_evidence_budget_exhausting . On-call sees 43 generated customs reports who…

Miss the holiday order cutoff and your cold email waits a full year: a corporate-gifting example

Some buyers only say yes during a few weeks each year. Miss those weeks and a good cold email doesn't get a "no", it gets "ask me next year". Here's…

The handler you assumed existed

The handler you assumed existed We were wiring up a lead pipeline: webhooks in, an agent working the conversation, bookings out. During planning, so…

Syncing a Google Sheet to a Mailjet List Without Re-Subscribing Anyone

A common setup: a customer list lives in a Google Sheet, and a nightly Apps Script job mirrors it into a Mailjet contact list so campaigns go to who…

Miss the fall deadline and your cold email loses the whole winter: a snow-removal example

Some cold emails don't just get ignored. They arrive after the buyer has already decided, and then the answer is "no" for a full year, no matter how…

Email From a Google Sheet: Claim the Row Before You Send It

Every guide to sending email from a Google Sheet ends with the same safety rule: write SENT next to each row after you mail it, so a rerun skips wha…

Express.js Transactional Email Service Wrapper: 5 Retry and Logging Layers

A welcome email should leave the request path quickly, but accepting a job is not the same as delivering a message. The reliable design is a small N…

Node.js Email Service: Auditing Deliverability, Template Testing, Preview, and Domain Auth

A compliance notice changes the email-service decision because a pleasant template editor and a provider-level "delivered" status are not an audit r…

Transactional Welcome Email Explained: Custom Domains and Template Ownership

Send transactional email from a dedicated subdomain, authenticate it with SPF and DKIM, publish a DMARC policy, and keep the template contract in th…

Transactional Email or SMTP Relay: Preserving 2FA Codes and Seller Alerts

A health marketplace has two clocks running at once: a seller should learn about a new order promptly, while a one-time code used to enter the selle…

From 3 lines to 2 cold emails: a worked example

Most cold emails fail before the first word because the writer never pinned down who they're writing to. Here's the method I use: start from three l…

Mail::alwaysTo() Guards One Mailer: The Staging Leak It Leaves Open

A few weeks ago I saved a link about keeping test emails away from real users. The plan was simple: add Mail::alwaysTo() to our staging setup and st…

Password Reset Email Deliverability Explained: Custom Domain Setup Through Template Ownership

Short answer: the best password-reset email setup is the one in which your team owns the message contract, your sending system owns authentication a…

Please Let Me Contact You Privately

How to Use Email API Events for Bounce Monitoring (Template-Owned Support)

TL;DR: For a marketplace contact form, choose an email API that can return durable bounce, complaint, suppression, and domain-health signals without…

Product Event Notifications: How to Compare Postmark, Resend, SendGrid, SES, and SMS

TL;DR: Keep the password-reset policy and template contract in your application, then let a provider render or deliver only what that contract permi…

Email Self Hosters - what are you using?

At the moment I self host using maddy for a bunch of domains that need a mailbox or catch all. There are some minor issues with it - some are me, so…

Golang tool to check SPF, DKIM, TLSA, and TLS settings for mailservers

Yes, I admit, this is 100% vibecoded, but it scratches an itch i've had for a while. Seems to work for my usecases at this time, but might add some…

Your Password Reset Email Is Probably in Spam: Deliverability for a Tiny SaaS

The usual story goes like this. Onboarding emails get low opens and almost no replies, so you rewrite the subject lines. Then rewrite them again. Th…

Transactional Email Operations: Compliance, Custom Domains, and Bounce Reconciliation

A signup system has one unforgiving constraint: a verification link that arrives late, twice, or not at all is a reliability failure at the exact mo…

outis: Fight AI spam by generating and sending a fake "user unknown" bounce emails

Outis fights spam generating and sends a fake "user unknown" bounce for an email you received, so the sender believes your address does not exist. T…

Gaming Email API Evidence — Bounce Handling, Complaint Suppression, Delivery Monitoring

For a gaming password-reset flow, choose an email API by the evidence it lets your team retain, not by the length of its feature list. TL;DR: requir…

How to Choose an Email Deliverability Service: 3 Custom-Domain Warmup Checks

A password-reset email has a short useful life. That operational constraint changes the vendor decision: choose the simplest system that can authent…

Cloudflare Email Routing vs Google Workspace vs Zoho for support@

Originally published at guushu.com/notes . I keep the original updated, so this copy may lag. My own support@ runs on the first column of the table…

The Shell & Email

Nineteen of Our Shared Mailboxes Were Being Read by Nobody

In April a customer complained to our managing director that he had been writing to us about a damaged pallet for seven weeks without a reply. He ha…

The Fake Complaint Spike: When "Spam Complaints" Aren't Real Complaints

Some providers log a complaint when a recipient just deletes unread. Here's how to tell a real spam complaint spike from a false one. The Fake Compl…

Cloudflare Email Worker inbox: store every message in D1 in 30 lines

Originally published at guushu.com/notes . I keep the original updated, so this copy may lag. Email Routing forwards a message and keeps nothing. If…