Insights on cold email, deliverability, and scaling your outreach infrastructure.
Verify email addresses before sending with four checks: syntax, MX lookup, an SMTP RCPT probe, and risk flags. Read every verdict and keep bounces under 2%.
How many sending domains do you need for cold email? Size it from volume with the safe 2-3 mailboxes-per-domain ratio. A 10,000/month team needs about 6-9.
Calculate how many email accounts you need for cold outreach: divide your monthly target by a safe 25-40 sends per warmed mailbox.
Exchange Online caps every mailbox at 30 messages per minute. Here's how to set per-mailbox throttle, send spacing, and ramp settings for safe cold email.
How to connect a custom SMTP server to your cold email tool: host, port 587 vs 465, TLS, and auth, plus the BYO-relay deliverability traps that hurt placement.
Free Gmail caps you at 500 recipients a day, paid Workspace at 2,000 messages. Here are Google's official sending limits and why chasing the max backfires.
A warmed cold-email mailbox should send roughly 20 to 50 messages a day, far below Google's 2,000-a-day cap. Here's the safe number and the reasoning why.
How to provision multiple Google Workspace accounts for cold email: domains, seats, MX, SPF, DKIM, and OAuth. Google caps each user at 2,000 messages a day.
Manual vs automated email warmup compared on time, consistency, cost, and risk. Manual suits one inbox; past three or four mailboxes, automation wins.
