October 26, 2026
Google bulk sender requirements 2026: who becomes a bulk sender at 5,000 a day, the 9 rules Gmail enforces, and which ones bind a B2B cold email program.
October 17, 2026
The gmail 0.3 percent spam rate is 3 reports per 1,000 inboxed emails, personal Gmail only. What it measures, who it covers, and why cold email trips it fast.
October 9, 2026
Should I send cold email from my main domain? No. What happens when you do, why a subdomain shares the risk, and the $22 a month setup that avoids it.
October 1, 2026
How many domains and inboxes for cold email: 1 inbox per 25 sends a day and 3 per domain. Published advice runs from 3 a day to 100, and why it differs.
September 23, 2026
How long to warm up an email domain: 3 to 4 weeks per inbox. Published schedules run 14 days to 8 weeks. The ramp, the platform limits, the readiness tests.
September 15, 2026
What DMARC policy for cold email? p=none on sending domains, p=reject on your brand domain. Gmail and Yahoo accept p=none, and RFC 9989 deleted the pct tag.
September 7, 2026
SPF DKIM DMARC setup for cold email: the exact records, the 10-lookup SPF limit, 2048-bit keys, and the DMARC policy to publish first. 40 minutes per domain.
September 6, 2026
Why are my cold emails going to spam? Usually authentication, not copy. The 11 real causes, ranked by what blocks you first, with the exact fix for each one.