I run several small sites on one Ubuntu VPS. Mail goes out through Postfix, gets signed by OpenDKIM, and then leaves through a shared SMTP relay (Hostinger, which sends onward via MailChannels). I don't send directly from the VPS because…
Text messages recover payments that email misses — they are opened faster, by more people, on the device where the customer's banking app also lives. Which is exactly why the interesting question about dunning SMS is not what the message says.
For the adjacent developer-tools workflow, treat the generated incident report similarly: the application owns the report bytes, checksum, recipient decision, and email template version; an email transport accepts the attachment and returns a transport identifier. This shared ownership boundary prevents…
A push notification has two lives. In the first, your server asks Firebase Cloud Messaging (FCM) or Apple's APNs to deliver it, and gets an answer. In the second, a phone somewhere decides whether to show it. Most debugging goes…
The cheap part of this decision is rarely the message itself. The expensive mistake is sending a high-volume alert to the wrong country, losing the record of why it was sent, or treating a delivery receipt as proof that a…
A contact form needs somewhere to send its data. HTML sends the submission to the address in the form's action attribute; the page itself has no mailbox. A thank-you message alone does not establish that an email arrived. GitHub Pages…
Gmail and Yahoo's bulk sender requirements in plain words, from official sources: who they apply to, what app emails need, and what to check before launch. Gmail and Yahoo have applied stricter rules to bulk senders since February 2024. Google calls…
Buyers' "where is my key?" threads show what goes wrong: keys land in spam, addresses are mistyped, keys get lost. A good email prevents those questions. Include: Sketch's keys start with SK3, so buyers can search their inbox for it. A…
The typing takes about ten minutes. DNS can take longer to update. This guide shows each step with example records, the mistakes we made while launching LuneaMail this month, and a checklist to confirm it works. A few terms first.
Two-factor authentication, also known as multi-factor authentication (MFA), is a security process that requires users to verify their identity using two different methods. These methods typically fall into three categories: By combining two of these categories, 2FA provides a more robust…
SMS/RCS, chat apps, email deliverability, and customer communications platforms.
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