Should I let an AI SDR send our cold email, and how do I stop it burning our domain?
Treat an AI SDR as a sending machine, because that is what decides whether it hurts you. The tools are good at research, list building and a first draft, and the damage comes from volume: an agent that writes and sends hundreds of lightly varied emails a day trips the same limits a careless person would, only faster. Gmail and Yahoo since February 2024, and Microsoft's Outlook.com since May 2025, expect SPF, DKIM and DMARC from bulk senders (Gmail and Microsoft draw the line at 5,000 messages a day), and Gmail and Yahoo want spam complaints under 0.3 percent. So keep the agent on secondary domains, never your main one, cap each mailbox at the twenty to thirty sends a day you would set for a person, verify every address, and watch bounce and complaint rates weekly rather than reply rates alone. Have someone read a sample of what went out every week, because generic generated mail is exactly what recipients mark as spam. If a vendor's pitch is how many emails it can send, treat that as the warning, not the feature.
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The counterweight to every AI SDR pitch deck, with the failure modes named and numbered: sender reputation collapse, intent-data false positives at 31 to 47 percent, and the eighteen month reply-rate half-life. Read it before you sign an annual contract.
It gives you a four part test (autonomy, reasoning, tool use, memory) to tell a real agent from a renamed feature, which is the skill a GTM leader needs in every vendor meeting this year. The numbers are sobering and useful: 62 percent of teams experimenting, only 23 percent in production.
Recorded in 2026, once teams had lived through the reply rate drop. It draws the same line the answer does, AI for research, routing and a first draft, humans for the voice, and it comes from a company that sells outbound tooling, so it is not an anti-AI pitch.
The clearest single page on the boring setup nobody explains to a first-time sender: why you buy secondary domains, what SPF, DKIM and DMARC actually do, and a three week warm-up schedule with real numbers rather than vague advice to go slow.
Microsoft's own announcement of the sender rules for Outlook.com, Hotmail and Live addresses, which made Microsoft the third of the big mailbox providers, after Gmail and Yahoo, to require authentication from bulk senders.
