Resources
The deliverability library.
Everything we know about email warmup, inbox placement, and cold outreach, in one place. Filter by type or search for the exact answer you need.
Everything That Matters Regarding Email Deliverability in 2026
Authentication mandates, AI filtering, warmup strategy, and the infrastructure non-negotiables. A complete technical guide for founders and operators running outbound.
PlaybookHow to Start Doing Cold Email Outreach in 2026
Domain setup, warmup, list building, copy that beats AI filters, and the stack you actually need, in the order that matters.
PlaybookAI Personalisation for B2B Email Conversion
The conversion math, the four levels of personalisation, why generic intro lines stopped working, and the deliverability constraint that gates it all.
Short ReadsHow long does email warmup take?
Two to four weeks, by scenario. New vs aged domains, Gmail vs Outlook, and what speeds it up.
Short ReadsWhy Outlook puts your emails in Junk
Microsoft's reputation-first filter, the deleted-unread signal, and how to rebuild trust.
Short ReadsWhy Gmail puts your emails in spam
Gmail filters on engagement first. Spam vs Promotions, and how to win the Primary tab.
Short ReadsWhat is a warmup network?
The inbox pool behind warming, and why network quality beats network size.
Short ReadsEmail warmup vs deliverability
One is the engine, the other the outcome. How they relate and where warmup fits.
Short ReadsWhat is inbox rotation?
How rotation spreads cold-email volume, and why every rotated inbox needs warming.
Short ReadsDedicated vs bundled warmup
Why your tool's built-in warmup may not be enough, and when it genuinely is.
Short ReadsWarmup for your cold email tool
How mailbox-level warming runs alongside Instantly, Smartlead, Apollo and the rest.
Short ReadsHow to re-warm a dormant inbox
A quiet domain decays fast. The re-warm ramp, and how to avoid needing it.
Short ReadsEmail reputation decay
Why reputation is a rolling score that slides when engagement stops, and the fix.
Short ReadsSubdomain or separate domain for cold email?
Which one protects your main domain, the trade-offs, and why both need warming.
Short ReadsHow many cold emails per day?
Provider caps vs safe volumes, ranges by domain age, and how to scale across mailboxes.
Short ReadsDo links impact email deliverability?
Short answer yes. The longer answer is about which links, how many, and where they point.
Short ReadsDoes email warming work?
Yes, when the engagement signals look like real human behaviour. The mechanism, the timeline, and what makes it fail.
Short ReadsWhy are my emails going to spam?
Ten reasons emails land in spam, how to diagnose which one is hitting you, and how to fix each.
Help & FAQsGetting started with email warming
Setup, defaults, and what to expect in your first week.
Help & FAQsInbox Reputation Score, explained
What the score actually measures, signal by signal.
Help & FAQsEmail warmup troubleshooting
Score stuck, ramp not advancing, mailbox kicked offline.
Help & FAQsSPF, DKIM, and DMARC explained
The three records receivers check first, in plain English.
Help & FAQsHow to warm up multiple domains
Warm a domain fleet in parallel, with a persona per inbox, without burning any.
Help & FAQsGmail, Yahoo & Microsoft sender requirements
The 2026 compliance checklist: auth, one-click unsubscribe, spam rate.
Help & FAQsEmail blacklist removal
Find the list, fix the cause, get delisted, then re-warm to recover.
Help & FAQsRecover a damaged sender reputation
The recovery ladder: stop the bleeding, fix the cause, re-warm at reduced volume.
vs All toolsBest email warmup tools (2026)
An honest, ranked look at the leading warmup tools and how to choose between them.
vs InstantlyMailStrike vs Instantly
Bundled warmup inside an outreach platform vs. a dedicated warming engine.
vs LemwarmMailStrike vs Lemwarm
Bundled warmup inside a sequencer vs. a dedicated warming engine with personas.
vs MailReachMailStrike vs MailReach
Two takes on warmup quality, dashboard depth, and diagnostic tooling.
vs MailwarmMailStrike vs Mailwarm
Daily caps and spam-score monitoring vs. monthly allocation and AI personas.
vs Warmup InboxMailStrike vs Warmup Inbox
12-language warmup vs. persona-driven warming with industry-personalised content.
vs WarmyMailStrike vs Warmy
All-in-one platform with 30+ language support vs. persona-driven warming.