Notes from the deliverability lab.
How to test a cold email campaign before you press send: the 8-check pre-flight
Eight checks that catch 90% of campaign-killing mistakes before a single message lands in a recipient inbox. Run them in 10 minutes.
The InboxLee TeamMay 23Cold email spam trigger words in 2026: which ones still matter and which ones do not
The classic spam-word lists are 90% noise in 2026. Modern filters look at patterns, not specific words. Here is what actually triggers Gmail and Outlook now.
The InboxLee TeamMay 23Email warmup tools compared: Smartlead vs Instantly vs Lemlist warmup networks
Three sending tools, three slightly different warmup networks. The differences matter for cohort consistency and how InboxLee reads the curve back.
The InboxLee TeamMay 23How to write a cold email subject line in 2026: what actually opens
Subject-line advice that survives Apple MPP and 2026 spam filters. The patterns that get opened, the ones that get filtered, and why the opener matters more.
The InboxLee TeamMay 23How to personalize cold email in 2026 without sounding like a template
Generic "{{first_name}}" is dead. So is reading every prospect's LinkedIn. Here is the middle path that scales and still feels human.
The InboxLee TeamMay 23The 2026 cold-email deliverability checklist: 17 things to verify before scaling
Comprehensive pre-scale checklist for cold-email infrastructure. Every item is binary - pass or fix - with the dig command or test to confirm.
The InboxLee TeamMay 23Cold email tools compared in 2026: Smartlead vs Instantly vs Lemlist vs Apollo
Four sending tools that dominate cold-email outreach. The honest comparison across cohort sending, reply detection, warmup network, and pricing.
The InboxLee TeamMay 23Cold email vs LinkedIn outreach in 2026: where each channel wins
Both channels work. They have different reply rates, different costs, different scaling curves, and different burn risks. Honest comparison from actual operator data.
The InboxLee TeamMay 23How to warm up a cold-email domain in 2026: the 30-day playbook
Domain warmup is different from mailbox warmup. The domain takes 30 days; the mailboxes take 14. Here is what to do during each.
The InboxLee TeamMay 23Gmail vs Outlook cold-email placement: what changes when your recipients use different providers
Workspace and M365 use different spam filters, different reputation systems, and different sender requirements. Here is how cold-email placement diverges between them.
The InboxLee TeamMay 23