Category: Blog

Reddit does not crown one best SMTP provider, but a few names dominate the threads: Amazon SES for a cheap reliable endpoint, Postmark for deliverability, and self-hosted Postal for the hands-on crowd.

MailerLite’s Free, Comfort, Power, and Enterprise plans compared: 2026 starting prices, subscriber-based billing, send limits, and the June price hike.

AMP for email adds interactive components, forms, carousels, live pricing, to messages in Gmail, Yahoo Mail, and Mail.ru. Here is the MIME structure, the sender registration requirement, the real use cases, and the trade-offs that determine whether it is worth building in 2026.

The safest email regex for most applications is the one browsers already run against fields, straight from the WHATWG HTML Living Standard. It catches malformed input, but it cannot confirm the mailbox on the other end exists, that takes a DNS lookup and an SMTP conversation.

Plain text and HTML are two different message formats, not two different reputations with mailbox providers. This guide covers when each wins, why deliverability depends on authentication and engagement rather than format, and how multipart/alternative sends both at once.

A DKIM selector is the label in a DKIM-Signature header’s s= tag that points a verifier to the right public key in DNS. Here’s how to find yours, read a real DNS lookup, and rotate selectors without breaking signatures still in transit.

How email OTP works: code length, expiry, hashed storage, and rate limits, plus how it compares to magic links and SMS OTP for login verification.

A magic link email authenticates a user with a single-use, expiring token instead of a password: click the link, land in an authenticated session. This covers the token contract, the security risks unique to email-based auth, and how magic links compare to email OTP and passwords.

A catalog of the 11 transactional email types every SaaS product sends, from welcome and password reset to receipts, invoices, and dunning notices, with what to include and a short example for each.

An invoice email needs the invoice number, due date, and total due in the body itself, not just the attached PDF, plus a working payment link and a sender address someone monitors. This guide covers what to include, subject line and reminder timing, deliverability, and a copy-paste template.

Dark mode doesn’t mean one thing across email clients. Apple Mail leaves your HTML untouched, Outlook.com flips only pure black and white, and Gmail’s iOS app rewrites colors throughout the message. Here’s how to control all three with CSS and keep logos legible everywhere.

A dedicated sending IP has no history, so mailbox providers judge it purely on what you do in the first few weeks. Learn the mechanics, a representative warmup schedule, and how to monitor progress on a dedicated IP.