SPF, DKIM, and DMARC are required. Without them, your emails land in spam regardless of sequence quality.
Settings → Sending Domains → Add Domain. Use a subdomain (e.g., mail.yourcompany.com) to protect your root domain.
v=spf1 include:smtp.lgai.io ~all
s1._domainkey.mail.yourcompany.com → s1.domainkey.lgai.ios2._domainkey.mail.yourcompany.com → s2.domainkey.lgai.io
At _dmarc.mail.yourcompany.com: v=DMARC1; p=quarantine; rua=mailto:dmarc@yourcompany.com; pct=100
Settings → Sending Domains → Verify. DNS propagation: 2–48 hours. All three must be green.
Do not launch campaigns until all three records are verified green.