Email deliverability, decoded.
Field notes, benchmarks, and practical guides on getting your email into the inbox, from authentication and reputation to content and the filters that decide it all.
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How to Send a Test Email in HubSpot (and Why It Is Not From You) The click path for a HubSpot test email, why it arrives from noreply@hubspot.com, what that breaks, and which checks need a real Send now instead. How to Send a Test Email in ActiveCampaign (Both Designers) The click path in the Email Designer and the Classic Designer, the 5-address cap, what will not render, and why ActiveCampaign disclaims its own Spam Check. How to Send a Test Email in Brevo (and Why the Links Expire) How to set up a Brevo test list, send a test from Preview & test, the 20-address cap, and why free-plan test links stop working after about 30 minutes. How to Send a Test Email in Constant Contact (and What It Changes) The Preview & Test click path, the five-address cap and 50-per-day limit, the test banner Constant Contact adds, and the footer links it removes. How to Send a Test Email in Amazon SES (and What It Proves) The SES console Send test email path, what the mailbox simulator addresses do, why the sandbox blocks external testing, and what SES charges for real placement. Email Subdomain vs Root Domain: What to Send From Should you send marketing email from a subdomain or your root domain? What a sending subdomain really isolates, what crosses anyway, and when not to migrate. DKIM2 and DMARCbis: What Changes Next in Email Authentication DKIM2 signs a message at every hop so forwarding no longer breaks authentication. Where the IETF draft stands, what DMARCbis changes, and what to do now. Top Email Spam Prevention Techniques for Marketers How to stop marketing emails landing in spam: list permission, subject lines, content testing, SPF, DKIM, DMARC, one-click unsubscribe and CAN-SPAM. Email List Hygiene: How to Keep a List Healthy Between Cleanings Email list hygiene is the ongoing discipline that keeps a list healthy: what degrades it, the warning signs, and the habits that stop a cleanup becoming urgent. Sender Score: What Validity’s 0 to 100 Rating Actually Measures Sender Score is Validity’s 0 to 100 rating of a sending IP, on a rolling 30-day average. What a good score is, how to check yours, and what it misses. Email Authentication Checklist: SPF, DKIM, DMARC, ARC, BIMI A per-protocol checklist for SPF, DKIM, DMARC, ARC and BIMI: what each standard does and the settings to get right for each one before you send. How to Improve Sender Reputation for Better Deliverability Discover how to improve sender reputation for enhanced deliverability with practical tips and strategies.
