Compliance and Privacy
One-Click Unsubscribe: How to Implement It
One-click unsubscribe is required for bulk senders and easy to implement wrongly — the common mistake silently removes subscribers who never asked to leave.
Oct 1, 20265 min read
Tag
#deliverability
36 articles tagged with deliverability.
Industry Guides
Email Marketing for Agencies: Client Playbook
Running email for clients means managing multiple reputations, approval chains, and definitions of success. This playbook covers service models, per-client reputation isolation, a 30-day onboarding, pricing bands, reporting that renews contracts, and scaling past ten accounts.
Sep 25, 202610 min read
Transactional & SMTP
How to Set Up a Dedicated Sending Domain
A dedicated sending subdomain isolates your marketing reputation from your corporate email. This walkthrough covers choosing the subdomain name, the five DNS records you need, step-by-step setup, how to verify DMARC alignment in real headers, warm-up pacing, and the mistakes that cost people a week.
Sep 23, 20269 min read
Transactional & SMTP
Email Log Monitoring: What to Track and Why
Email logs record what receiving servers actually said about your mail. Here's which events matter, how to read SMTP response codes, the alerts worth configuring, stream separation, retention rules and a weekly review routine.
Sep 21, 20269 min read
Transactional & SMTP
Dedicated SMTP Server: When You Actually Need One
Self-hosted server, dedicated IP, or shared relay? They are three different decisions and most teams pick the expensive one for a hypothetical problem. A side-by-side comparison, the five cases that justify dedicated infrastructure, and the hidden ops costs nobody scopes.
Sep 20, 20269 min read
Design and Accessibility
Plain Text vs HTML Email
Plain text emails do not automatically get better deliverability — that myth has cost people a lot of design work. Here is what the evidence supports and when each format wins.
Sep 20, 20265 min read
Metrics & Benchmarks
Delivery Rate vs Deliverability: The Difference
Delivery rate tells you the receiving server accepted your email. Deliverability tells you it reached the inbox instead of the spam folder. Learn how to calculate both, why a 99% delivery rate can hide a placement disaster, how to diagnose spam folder placement without seed testing, and the benchmarks worth holding yourself to.
Sep 20, 20268 min read
Deliverability
Email Feedback Loops (FBLs) Explained
Feedback loops are the only direct way to see who is marking your email as spam. Here's how FBLs work, which providers offer them, why Gmail is different, what complaint rate is too high, how to register, and how to turn complaint data into a real fix.
Aug 28, 20269 min read
Deliverability
Soft Bounce vs Hard Bounce: The Difference
A hard bounce is a permanent 5xx failure — remove the address immediately. A soft bounce is a temporary 4xx failure that gets retried. This guide covers the SMTP codes behind each, healthy bounce rate benchmarks, the suppression thresholds that protect your sender reputation, and how to read a bounce log to diagnose the real problem.
Aug 27, 20268 min read
Deliverability
How to Warm Up a New Sending Domain
A new sending domain has no reputation, and mailbox providers treat unknown high-volume senders as spam by default. This guide covers the prerequisites, a day-by-day 30-day warm-up schedule, provider-by-provider staging for Gmail and Outlook, and a diagnostic table for when a warm-up starts going wrong.
Aug 26, 20269 min read
Deliverability
The Email Deliverability Checklist (2026)
A practical email deliverability checklist for 2026: the four numbers that tell you where you stand, the authentication records you must get right, sending domain structure, list hygiene rules, unsubscribe mechanics, content checks, monitoring cadence, and a 20-minute triage sequence for when inbox placement suddenly drops.
Aug 25, 202610 min read
Deliverability
How to Lower Your Email Bounce Rate
Bounce rate over 2% is already costing you inbox placement. Here is the SMTP code reference, the seven causes ranked by damage, a five-step cleanup plan, a domain warm-up schedule, and what to check when bounces spike overnight.
Aug 21, 20269 min read
Deliverability
What Is Email Bounce Rate? (Hard vs Soft)
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.
Aug 20, 20269 min read
Deliverability
SPF vs DKIM vs DMARC: What Each Record Does
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.
Aug 19, 20269 min read
Transactional & SMTP
Dedicated IP vs Shared IP: Which Should You Use?
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.
Aug 17, 20269 min read
Transactional & SMTP
What Is a Transactional Email? (+ Examples)
A transactional email is a one-to-one message triggered by a user action. Here is how it differs from marketing email, 16 examples to audit your product against, the SMTP ports and DNS records you need, and where promotional content crosses the line.
Aug 13, 20268 min read
Deliverability
Email Sending Limits by Provider (and How to Scale)
Personal inboxes cap you at a few hundred emails a day, business suites at a few thousand. Here is what every provider tier actually allows, the four separate limits that stop sends, how to size the volume you really need, and a warmup ramp for scaling without tripping spam filters.
Aug 11, 20269 min read
Deliverability
Reverse DNS for Email: Why PTR Records Matter
Reverse DNS maps your sending IP back to a hostname via a PTR record, and receiving servers check it before they decide whether to trust you. Here is how PTR records work, what forward-confirmed reverse DNS proves, who controls the record, how to verify it in two minutes, and the mistakes that quietly cost you inbox placement.
Aug 10, 20268 min read
Deliverability
BIMI Records: Setup, Requirements, and Value
BIMI puts your brand logo next to your emails in supporting inboxes, but only after DMARC enforcement and a verified mark certificate. Here is what BIMI requires, how to publish the record, how to prepare an SVG Tiny PS logo, where it actually renders, and how to decide whether the annual certificate cost is worth it for your sending program.
Aug 9, 20268 min read
Deliverability
Spam Complaint Rate: Benchmarks and Fixes
Spam complaint rate is the share of delivered emails marked as spam. Gmail and Yahoo cap bulk senders at 0.3%. Here are realistic benchmark bands, the real causes of complaints, seven fixes that work fast, and a 30-day plan to bring the number down.
Aug 8, 20268 min read
Deliverability
Email Throttling: What It Is and How to Handle It
Email throttling is a temporary rate limit from receiving mail servers, not a rejection. Learn how to spot it in your SMTP logs, tell it apart from a block, read the deferral codes, and fix it with per-domain pacing, sane retries, and a proper warm-up schedule.
Aug 6, 20268 min read
Deliverability
How to Avoid the Gmail Promotions Tab
Gmail files mail in Promotions when it looks like bulk marketing. Here is what the classifier actually weighs, the structural and copy changes that move you toward Primary, the tactics that waste your time, and how to test placement properly before redesigning your whole program.
Aug 5, 20268 min read
Transactional & SMTP
What Is an SMTP Relay (and When to Use One)?
An SMTP relay forwards your outgoing email through trusted servers so it reaches the inbox. Learn how relays work, how they differ from direct delivery, and when to use one.
Jul 11, 20268 min read
Transactional & SMTP
SMTP Relay Services: How They Work + What to Look For
How SMTP relay services deliver your email, and the concrete criteria to evaluate one: authentication, IP reputation, own-domain sending, reporting, and pricing.
Jul 10, 20269 min read
Transactional & SMTP
Transactional vs Marketing Email: The Difference
Transactional emails are triggered by a user's action; marketing emails promote to a list. Here's the difference in purpose, consent, deliverability, and design.
Jul 9, 20268 min read
Deliverability
Email Authentication: SPF, DKIM, DMARC & BIMI
Email authentication proves your mail really comes from you. Learn how SPF, DKIM, DMARC, and BIMI work together to stop spoofing and land in the inbox.
Jul 8, 20269 min read
Deliverability
SPF, DKIM & DMARC Explained (Plain English)
SPF, DKIM, and DMARC explained without the jargon. See what each DNS record does, how they work together, and the safe order to roll them out.
Jul 7, 20268 min read
Deliverability
How to Stop Emails Going to Spam: 12 Fixes
Twelve practical fixes to stop your emails going to spam, from SPF, DKIM, and DMARC authentication to list hygiene, engagement, and content.
Jul 6, 20269 min read
Deliverability
Why Are My Emails Going to Spam?
Emails going to spam? The real causes are authentication gaps, a damaged sender reputation, a stale list, and low engagement. Here is how to diagnose yours.
Jul 5, 20268 min read
Deliverability
How to Check if Your Domain Is Blacklisted
Learn how to check if your domain or IP is on an email blacklist like Spamhaus, Barracuda, or SORBS, why it happened, and how to get delisted.
Jul 4, 20269 min read
Deliverability
IP Warming: A Day-by-Day Warm-Up Schedule
IP warming builds sender trust by ramping email volume gradually. Get a day-by-day warm-up schedule, the metrics to watch, and mistakes to avoid.
Jul 3, 20269 min read
Metrics & Benchmarks
What's a Good Email Open Rate? (Benchmarks)
A good email open rate sits roughly in the 20-35% range for most industries. See approximate benchmarks by industry, why privacy changes inflate the metric, and how to improve a low open rate.
Jun 29, 20268 min read
Metrics & Benchmarks
How to Calculate Email Open Rate (Formula)
Email open rate = (unique opens / emails delivered) x 100. See the formula, a step-by-step worked example, why you divide by delivered (not sent), and related metric formulas.
Jun 28, 20267 min read
List Building
How to Clean Your Email List (Step-by-Step)
A practical, step-by-step guide to cleaning your email list: verify addresses, suppress bounces, re-engage the quiet, and prune the dead so your mail actually reaches the inbox.
Jun 26, 20269 min read
Deliverability
How to Improve Email Deliverability: 10 Proven Strategies
SPF, DKIM, DMARC, list hygiene, and sender-reputation tactics that keep your campaigns landing in the inbox instead of the spam folder.
May 5, 202610 min read
Deliverability
Improve Email Deliverability: Best Practices & Tool
Improve email deliverability and ensure your email lands in the inbox! Discover best practices to boost deliverability rates & monitor email marketing success.
Apr 5, 202612 min read