162 posts · page 11 of 18
Email bounce rate explained: the formula, the difference between hard and soft bounces, what SMTP codes like 450 and 550 actually mean, what counts as a good bounce rate, and nine concrete ways to lower yours before it damages inbox placement.
Seven thank you email examples — post-purchase, referral, review, donation, anniversary and more — with the timing window for each, subject lines that don't sound automated, and the mistakes that turn gratitude into just another promotion.
SPF authorizes sending servers, DKIM signs messages cryptographically, and DMARC ties both to your visible From address with a policy and reporting. A plain-English comparison of all three DNS records, the exact syntax, the 10-lookup limit, alignment rules, and the staged rollout order that gets you to p=reject without blocking your own mail.
Newsletters run on your calendar; drip campaigns run on each subscriber's clock. This guide breaks down what each format is genuinely good at, a four-question test for deciding where any message belongs, how to run both without burning out your list, and the metrics that judge each one fairly.
An email API POSTs JSON over HTTPS; SMTP relay runs a multi-step protocol conversation on port 587. This guide compares the two on latency, batching, error handling, templates, and vendor lock-in, includes a full port reference table, and shows the hybrid setup most teams actually end up running.
Behavioral email triggers fire on what subscribers do, not on your send calendar. This guide covers the five triggers worth building first, the four parts of every automation, how to set delays that feel helpful instead of creepy, the guardrails that prevent over-sending, and how to measure triggered mail on completion rate rather than opens.
A shared IP pools your sending reputation with other senders; a dedicated IP gives you an address nobody else uses. This guide compares both across reputation, warmup, volume thresholds, and risk — with a side-by-side table, a realistic warmup schedule, and the deliverability fixes that matter more than either choice.
Renewal reminders are a retention tool, not billing paperwork. Here is the four-email sequence, what every renewal notice must state, a dunning cadence that recovers failed payments, risk-based segmentation, and the metrics that tell you it worked.
A practical reference for SMTP error codes: how to read a reply in ten seconds, the difference between 4xx soft bounces and 5xx hard bounces, lookup tables for the codes you will actually hit, and fixes for the five that cause most real-world pain — plus the ports that quietly cause silent failures.
The month's most useful guides and one practical tip, on the first Tuesday. Nothing else.
