Author
Ravi Kewat (page 16)
September 1, 2026
MX Records for Multi-Domain Cold Email: Setup and Common Mistakes
How MX records work across a fleet of sending domains, why replies get lost when they are wrong, and the setup mistakes that quietly cost you meetings.
Read article →
August 31, 2026
Cold Email Ramp Schedule: How Fast You Can Safely Increase Volume
A week-by-week schedule for ramping new domains and mailboxes, the metrics that tell you to slow down, and how to recover when you have pushed too hard.
Read article →
August 28, 2026
How Many Mailboxes Do You Need for Cold Email? (With the Actual Math)
Work out how many mailboxes and domains your sending volume requires, why the safe per-mailbox limit is lower than the technical one, and how much headroom to buy.
Read article →
August 27, 2026
Bulk DNS Updates for Cold Email: How to Manage 50+ Domains Safely
Managing SPF, DKIM and DMARC across dozens of sending domains by hand is where silent deliverability failures come from.
Read article →
August 26, 2026
SMTP Relay vs SMTP Server: Which One Cold Email Actually Needs
The difference between an SMTP relay and your own SMTP server, what each does to deliverability and control, and which one makes sense at your sending volume.
Read article →
August 25, 2026
SMTP Error Codes Explained: 550 5.7.1 and the Ones That Actually Matter
A practical guide to the SMTP errors cold email senders hit most, what each one is really telling you, and the fix for each, including 550 5.7.1 and 5.7.26.
Read article →
August 19, 2026
Monthly vs Annual Billing for Cold Email Tools: The Lock-In Trap
Annual plans advertise a discount. For outbound teams whose volume moves, they often cost more. Here is the actual math on commitment.
Read article →
August 17, 2026
AI Reply Agents Compared (2026): Customization, Guardrails and Handoff
AI reply agents all demo well. This compares them on what actually matters in production: tone control, objection handling and escalation rules.
Read article →
August 14, 2026
ICP Scoring for Outbound: How to Stop Emailing Bad-Fit Leads
Bad-fit leads cost you more than a wasted send: they cost deliverability. How ICP scoring works, and which signals actually predict fit.
Read article →
August 12, 2026
Google Workspace Cold Email Cost: The Real Math Per Mailbox
What Google Workspace mailboxes actually cost for cold email once you account for resellers, mailbox count, domains and DNS.
Read article →
