Resources
Everything here comes from running the infrastructure ourselves — no filler, no farmed content.
SPF, DKIM and DMARC for Cold Email — Records That Actually Pass
One merged SPF record, a DKIM key that really signs, DMARC from p=none to quarantine, and the two failures that break most setups: duplicate SPF records and a guessed Microsoft DKIM target.
How Many Cold Emails Per Day? The Safe Sending Math
8 to 10 per mailbox per day, and the arithmetic that follows: why it is far below Google's 2,000, the ramp week by week, how follow-ups change your list size, and when to send less.
Cold Email Infrastructure: The Complete Setup Guide
Domains, mailboxes, DNS and warm-up for cold email, with the numbers we send against: 8-10 a day per mailbox, 2 mailboxes per domain, 2-3 weeks of warm-up, and what each route costs.
emailcampaign.ai vs Instantly
emailcampaign.ai vs Instantly: both warm unlimited mailboxes. Only one buys the domains, creates the Google Workspace or Microsoft 365 mailboxes and writes the DNS.
emailcampaign.ai vs Smartlead
emailcampaign.ai vs Smartlead: unlimited mailboxes and warmup on both. Only one builds the domains, mailboxes and DNS for you, and prices your volume to the cent.