Email Deliverability Editor

Lena Hart

Lena writes about the part of email most people never see until it breaks: getting mail into the inbox. Sending infrastructure, domain authentication, sender reputation, and the rules mailbox providers and anti-spam laws expect a sender to follow.

Articles by Lena Hart (33)

Domain Knowledge

Transactional vs Marketing Email: What's the Difference

Receipts and password resets follow different rules from newsletters and promotions. How to tell them apart, and why to send them separately.

Sep 30, 2026 3 min read Beginner Email Marketing Basics, Sender Reputation, Can Spam 0 0

Domain Knowledge

Email Deliverability Explained: How Mail Reaches the Inbox

Delivered is not the same as inboxed. What Gmail, Yahoo and Microsoft weigh before they file your email, their sender rules, and the AcelleMail settings.

Sep 30, 2026 13 min read Beginner Email Marketing Basics, Inbox Placement, Sender Reputation 0 0

Email Infrastructure

Choosing the Queue Driver: Database vs Redis vs SQS for AcelleMail

AcelleMail ships with `QUEUE_CONNECTION=database` as the default — and that's the right choice for installations up to ~500k emails per day. Past that threshold, database-queue contention starts to dominate worker time, and switching to Red...

Jul 4, 2026 12 min read Advanced Acellemail 1 8

DNS & Domain Setup

BIMI with VMC — Cost, Process, and Whether It's Worth It

VMC (Verified Mark Certificate) costs $1,500/yr per domain and takes 4-8 weeks to obtain. This guide walks the cost math, the trademark requirements, the alternative paths, and a decision framework for whether VMC is right for your sending...

Jul 4, 2026 7 min read Advanced Acellemail 3 16

DNS & Domain Setup

Custom Tracking Domain — Brand Your Open & Click Links in AcelleMail

By default your open- and click-tracking links route through the platform's own domain. Point them at your own subdomain (e.g. track.yourdomain.com) so every link recipients hover looks like yours. This guide walks the real Tracking Domains...

Jul 4, 2026 6 min read Intermediate Acellemail 3 15

Sending & Deliverability

Deliverability Incident Runbook — From Alert to Recovery in AcelleMail

Bounce rate spiked. Complaint volume jumped. A campaign is stuck on Sending. This is the step-by-step runbook for when something breaks — every check runs from the dashboard, in the order that resolves most incidents fastest.

Jul 4, 2026 8 min read Intermediate Acellemail 2 12

DNS & Domain Setup

Rotating Your DKIM Key in AcelleMail — How to Publish a Fresh Key

AcelleMail has no in-app "rotate key" button — a sending domain's DKIM keypair is fixed at creation. To rotate, you delete the domain and re-add it (which generates a fresh key), publish the new DKIM record at your DNS host, then click Veri...

Jul 4, 2026 8 min read Advanced Acellemail 3 19

DNS & Domain Setup

DMARC Enforcement Migration — From p=none to p=reject in 90 Days

Going from no DMARC to p=reject all at once breaks your own legitimate mail. The 3-stage migration (none → quarantine → reject) is the safe path. This guide walks the 90-day plan, what to monitor at each stage, when to roll back.

Jul 4, 2026 7 min read Intermediate Acellemail 3 16

Sending & Deliverability

Gmail Postmaster Tools Walkthrough — IP Reputation for AcelleMail Senders

Google Postmaster Tools is free. It shows your Gmail-side spam rate, IP reputation, domain reputation, and authentication pass rates. This guide walks the signup, the daily-check routine, and how to wire findings back into AcelleMail.

Jul 4, 2026 6 min read Intermediate Acellemail 3 13

Sending & Deliverability

Microsoft SNDS Walkthrough — Outlook IP Reputation in AcelleMail Context

Microsoft's Smart Network Data Services (SNDS) shows per-IP reputation for outlook.com / hotmail.com / live.com. This guide walks the SNDS signup, wiring AcelleMail's sending IPs in, and daily-checking the panel.

Jul 4, 2026 7 min read Intermediate Acellemail 2 13

Sending & Deliverability

Multi-Server Rotation in AcelleMail — How the Dispatcher Picks

Once you have 2+ sending servers, the AcelleMail dispatcher distributes per-message across them. This guide explains the rotation logic, how to verify it in the admin pool, and how to override for deterministic routing.

Jul 4, 2026 6 min read Intermediate Acellemail 3 13

DNS & Domain Setup

Return-Path and Envelope-Sender — Quick Setup in AcelleMail

The 5-minute setup: pick a bounce subdomain, publish the MX record, set the sending-server config, verify. This is the practical companion to [Return-path and envelope-sender explained](/kb/articles/return-path-and-envelope-sender-explained...

Jul 4, 2026 5 min read Beginner Acellemail 4 17

Sending & Deliverability

Amazon SES Sending Limits — Cookbook for AcelleMail Operators

SES starts at 200/day sandbox, scales to 50k+/day in production, $0.10 per 1,000 emails. This guide is the practical cookbook: how to grow from sandbox to scale, region-by-region orchestration, what AcelleMail does at each tier.

Jul 4, 2026 8 min read Intermediate Acellemail 3 14

DNS & Domain Setup

SPF Record Deep Dive — Mechanisms, Limits, and Edge Cases

SPF looks simple: list your sending IPs. The real-world version: 10-lookup limits, include-chains, the difference between -all and ~all, SPF flattening at scale. This is the operator's deep dive.

Jul 4, 2026 7 min read Advanced Acellemail 4 18

Sending & Deliverability

Domain Warmup — Building Reputation on a New Sending Domain

IP warmup is half the story. Your sending domain also accrues reputation independently — and a fresh domain takes 30-60 days to reach full standing at major ISPs. This guide is about the domain side: separate from but interlocking with IP w...

Jul 4, 2026 7 min read Intermediate Acellemail 2 13

Sending & Deliverability

Feedback Loops (FBL) — Setup + Wire in AcelleMail

When a recipient clicks "Mark as Spam" on a Microsoft / Yahoo / AOL / Comcast mailbox, those ISPs send you the complaint via Feedback Loop. AcelleMail processes it automatically — unsubscribes the complainer, updates the complaint stats. Th...

Jul 4, 2026 7 min read Intermediate Acellemail 3 11

Sending & Deliverability

IP Warmup by ISP — Per-Receiver Ramp Strategy in AcelleMail

Gmail, Microsoft, Yahoo, and iCloud each react differently to a brand-new IP. A single uniform warmup curve ramps too fast for the strict receivers and too slow for the forgiving ones. This guide shows how to split warmup by recipient ISP u...

Jul 4, 2026 9 min read Advanced Acellemail 3 16

Sending & Deliverability

Sender Reputation Monitoring — What to Watch in AcelleMail

Three numbers tell you most of what receiving servers think of you: bounce rate, complaint (spam) rate, and how engaged your list is. AcelleMail surfaces them on the campaign Overview tab and its Bounce log + Feedback log. This guide shows...

Jul 4, 2026 8 min read Intermediate Acellemail 3 15

Sending & Deliverability

Sending Throttling Strategies — Pace Your Volume in AcelleMail

Blast 500k emails at once and you'll throttle yourself: receiving servers tar-pit you, your IP reputation drops, complaint rate spikes. AcelleMail's per-server sending limit lets you pace. This guide walks the UI + 4 throttling patterns by...

Jul 4, 2026 7 min read Intermediate Acellemail 3 14

Email Infrastructure

Email Queue Architecture in AcelleMail (Why Sends Are Steady, Not Sudden)

AcelleMail uses a job queue to pace out large sends — instead of trying to push 50,000 emails at once, workers pick recipients off a queue one at a time. This explainer covers why that matters for deliverability and how to read the campaign...

Jun 6, 2026 5 min read Intermediate Acellemail 1 6

DNS & Domain Setup

Return-Path vs Envelope-Sender — What Each Does in AcelleMail

The "From" address recipients see isn't the address that handles bounces. That's the envelope-sender (also called the return-path or MAIL FROM). This guide separates the three sender concepts and shows where AcelleMail configures each.

Jun 1, 2026 6 min read Intermediate Acellemail 3 16

Sending & Deliverability

How to Set Up Amazon SES with AcelleMail

Create an IAM user and access key in AWS, connect Amazon SES to AcelleMail, share your verified domains with users, and let them verify their own.

Jun 1, 2026 10 min read Intermediate Amazon SES, Bounce Handling, Acellemail 3 13

Sending & Deliverability

Hard Bounce vs Soft Bounce — Reading the Bounce Log

A hard bounce is permanent; a soft bounce is temporary. AcelleMail records them in the campaign bounce log and treats them differently — hard bounces blacklist the address, soft bounces are left alone for the receiving server to retry. This...

May 24, 2026 9 min read Beginner Acellemail 2 10

Sending & Deliverability

Email Throttling & Rate Limits — What's the Difference

Throttle, rate limit, sending limit. Different words, often confused. This guide separates them plainly — who enforces each — and shows the one control you actually set in AcelleMail: the per-server Sending limit.

May 16, 2026 5 min read Beginner Acellemail 2 14

Articles by Lena Hart (33)

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