Can I email past customers, networking contacts, and add …

Past customers: yes. An existing business relationship is the classic legitimate basis, and CAN-SPAM permits commercial mail with honest identification and a working unsubscribe. Adding customers to routine service emails automatically is normal; adding them to a MARKETING newsletter deserves a one-line ask or at least an obvious first-email opt-out.

Free · no signup · last reviewed August 29, 2026

Past customers: yes. An existing business relationship is the classic legitimate basis, and CAN-SPAM permits commercial mail with honest identification and a working unsubscribe. Adding customers to routine service emails automatically is normal; adding them to a MARKETING newsletter deserves a one-line ask or at least an obvious first-email opt-out.

Networking-event cards: legally workable in the U.S., but etiquette earns more than law allows. A personal 'great meeting you, want the monthly tips email?' converts a handshake into a subscriber; silently bulk-importing a card stack converts it into spam reports.

The universal rules regardless of source: identify yourself, unsubscribe honored instantly, and never let anyone wonder how you got their address.

Keep going

CAN-SPAMThe U.S. commercial-email law: truthful headers and subjects, a physical postal address, a…List HygieneThe practice of keeping an email list clean: removing bounces, validating addresses, sunse…Email Nurture That Runs ItselfThe three sequences that cover 90% of businesses, the frames that outlast templates, the p…

This is the work. Want it done?

Everything here is free to use yourself. That’s the point. If you’d rather a senior marketer just handle it, in your accounts and your name: 20-minute call, no pitch deck.

Contact