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What it is
Email marketing set up and then run for you. Sequences that welcome, nurture and sell, sent from infrastructure that actually lands in the inbox.
The list is the only audience you own. Every other channel charges rent to reach your own customers, and the rent goes up whenever the platform pleases. Email costs nearly nothing per send, compounds with every customer you add, and keeps working when the ad account is paused.
Deliverability is proven here, not assumed. I check the DNS records that decide whether you land in the inbox, clean the list so you never pay to email dead addresses, and test the full send and reply path before campaigns go out. I once traced a single drifted DNS record that silently killed every send for a week: that is the failure mode this prevents.