KBKishore Bhavnanieindnsassistant.hashnode.dev·4d ago · 7 min readEmail Deliverability Beyond SPF, DKIM, and DMARCSPF, DKIM, and DMARC are the foundation of email authentication, and any organization serious about deliverability and anti-spoofing needs all three. But they are not the whole story. A newer set of s00
RSRachel Smithinagentgtm.hashnode.dev·Jul 27 · 4 min readCold Email Deliverability Checklist (2026)Originally published on agentgtm.app. The 10 checks we run before any campaign sends. Authentication, warmup, verification, pacing, and recovery. Deliverability is binary: your email lands in the inbo00
Eevgeniinmailtester.hashnode.dev·Jul 20 · 2 min read83.4% of the web's email runs on just 3 providersBy the team at MailTester Ninja, a real-time email verification API that stores nothing. Across 50,000 domains, mail hosting is strikingly concentrated: Top 1 provider handles 32.4% of mail-enabled d00
Eevgeniinmailtester.hashnode.dev·Jul 16 · 2 min readWho actually enforces DMARC? Reject rates by email providerBy the team at MailTester Ninja, a real-time email verification API that stores nothing. DMARC enforcement isn't spread evenly, it tracks who hosts the mail. Share of each provider's domains that reac00
SSapotaCorpinsapotacorpvn.hashnode.dev·May 24 · 4 min readDouble Opt-In in SFMC: When It's Worth the Extra StepA retail client we audited had bounce rates three times industry average and a decaying sender reputation nobody could explain. Tracking back, the source was in-store signups: cashiers manually keyed 00
SSapotaCorpinsapotacorpvn.hashnode.dev·May 24 · 4 min readSalesforce Abuse Emails and the Bounce Thresholds You Have to RespectTeam wakes up one morning to an email from abuse@abuse.salesforce.com. Reads like something a spammer would send, gets deleted. Three days later the account can't send email. This actually happens on 00
SSapotaCorpinsapotacorpvn.hashnode.dev·May 24 · 4 min readSFMC Email Frequency and Spam Filters: Send Enough, Not Too MuchA retail client we advised decided to quadruple email frequency - from one send per week to four - believing more sends would mean more revenue. Within a month: Unsubscribe rate tripled. Complaint ra00
SSapotaCorpinsapotacorpvn.hashnode.dev·May 24 · 4 min readSender Profile, Delivery Profile, Send Classification: What Each DoesNew client onboarding, typical request: "Make sure emails send from orders@company.com, show From as Company Store, use a separate IP for transactional email, and follow CAN-SPAM Transactional rules."00
SSapotaCorpinsapotacorpvn.hashnode.dev·May 24 · 4 min readIP Warming in SFMC: The Four-Week Ramp That Protects ReputationA retail client wanted to separate their transactional email onto a dedicated IP for better reputation isolation. They bought the IP on Monday and on Tuesday wanted to blast 500,000 emails through it.00
SSapotaCorpinsapotacorpvn.hashnode.dev·May 24 · 4 min readSubscriber Acquisition for SFMC: Channels That Actually ConvertOne of the earlier conversations on a new SFMC engagement usually includes the client asking for a way to "grow the list fast." The worst answer is to buy a list from a data broker. The second-worst a00
