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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.
Read more →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.
Read more →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...
Read more →You've set up a custom tracking domain. Now scale it: multiple tracking domains for reputation isolation, HTTPS enforcement, multi-region routing, programmatic verification. This is the advanced companion to the basic setup guide.
Read more →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...
Read more →Ubuntu 24.04 LTS ("Noble Numbat") is the recommended host for a 2026 AcelleMail install. PHP 8.3 in universe, MySQL 8.0 from the official repo, supported until April 2029. This guide walks the install end-to-end — from a freshly-provisioned...
Read more →Debian 12 ("Bookworm") is the lightest-weight production host for AcelleMail — same Linux family tree as Ubuntu, fewer pre-installed surprises, supported through 2028 (and through 2033 with Freexian ELTS). This guide covers the three meanin...
Read more →Rocky Linux 9 is the community RHEL 9 rebuild — the right choice when your operations policy requires a Red Hat-family OS without paying for a RHEL subscription. CentOS Stream 9 and AlmaLinux 9 work identically. The four big differences fro...
Read more →DigitalOcean is one of the friendlier ways to run AcelleMail in production — cheap droplets, simple console, and a managed Cloud Firewall that keeps SMTP exposure honest. This guide walks the DigitalOcean-specific bits end-to-end: droplet s...
Read more →AWS EC2 is the right AcelleMail host when (a) you already operate on AWS and want to consolidate, (b) you want SES on the same network plane for sub-millisecond API latency, or (c) you need a specific region/VPC posture. The trade-off vs Di...
Read more →A fresh AcelleMail install is functionally complete the moment the web installer turns green — but it isn't yet production-grade. The default leaves easy-to-fix exposures: SSH password auth on, no fail2ban, no automated backups, no monitori...
Read more →Gmail accepts new IPs faster than Microsoft. Yahoo is slower than both. Apple iCloud is the strictest. A uniform warmup misses these per-receiver curves. This guide segments your warmup by recipient ISP for faster reputation building.
Read more →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...
Read more →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...
Read more →Three numbers tell you everything: bounce rate, complaint rate, and inbox placement. AcelleMail surfaces all three in the campaign report and sending-server panels. This guide walks where each one lives + when to act on it.
Read more →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.
Read more →When you send a campaign at "9am" — whose 9am? Yours, your subscribers'? AcelleMail's scheduler defaults to your account timezone. This guide walks the UI + timezone-aware patterns + send-time optimization.
Read more →A confirmation email is just the start. Layer in a delivery-day check-in, a 7-day review request, a 30-day cross-sell, a 60-day "we miss you". This guide builds the full post-purchase flow in AcelleMail's automation builder using tags or cu...
Read more →Twelve subject formulas, ranked by reliability across audiences and industries. With examples + when each formula applies + the AcelleMail subject-field walkthrough.
Read more →AcelleMail doesn't ship a native Zapier app, but the REST API + webhook system gives you everything you need to wire AcelleMail to the 7,000+ apps on Zapier. This guide walks both directions — AcelleMail as a Zapier action (POST to API), an...
Read more →AcelleMail can be operated as a multi-tenant SaaS where each customer signs up, picks a plan, pays via Stripe, and gets an isolated workspace (lists, campaigns, automations, sending quotas). This guide walks the end-to-end setup: Extended L...
Read more →A/B testing the subject lifts open rates 10-30% sustainably. AcelleMail's built-in A/B feature splits your list, picks the winner automatically, ships the winning variant to the rest. This guide walks the setup + the discipline that makes t...
Read more →Canada's Anti-Spam Legislation is one of the strictest in the world — fines reach CAD $10 million per violation. This guide covers express vs implied consent, what every Canadian CEM must contain, and how to record consent inside AcelleMail...
Read more →New blog post published? AcelleMail can detect it via RSS and auto-send to your list. This guide walks the RSS campaign type, the feed URL setup, and the template that maps RSS items into email blocks.
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