Email isn't dead: the underrated channel that cuts paid CAC in half

Every account audit I do starts with ad platforms, and almost every time, the biggest missed opportunity is sitting in an email list that hasn’t been touched properly in months.

Email doesn’t compete with paid — it makes paid cheaper. A few ways I actually use it:

• Post-purchase flows that reduce repeat-purchase CAC to near zero. If a customer already trusts you enough to buy once, a well-timed flow can bring them back without spending another euro on ads for that sale.
• Suppressing recent purchasers from paid retargeting. This alone often cuts wasted spend meaningfully — you stop paying to “acquire” someone who already bought last week.
• Warming cold traffic before it ever sees an ad. A lead magnet that captures an email before the sale, followed by a short nurture sequence, means the paid ad that eventually asks for the sale is talking to a warmer audience than cold traffic ever is.

The accounts with the lowest blended CAC I’ve worked on aren’t the ones with the cleverest Meta targeting — they’re the ones where email and paid are pulling in the same direction instead of being run by two people who’ve never spoken to each other.

If your email flows haven’t been touched since launch, that’s very likely the cheapest win available to you right now — cheaper than anything a new ad campaign could deliver.