Use the context you already have
Start with the last meaningful interaction: a request, an appointment, or an event. Use that context to decide whether another message would be useful.
Avoid pretending that an automated message is a personal conversation that never happened. Be direct about who is sending and why.
Give each step a different job
The first step might share requested information. A later step might offer help or remind someone of a deadline. Each step should add something rather than repeat the same sales pitch.
Space messages sensibly and review subscription preferences before enrolling contacts. Keep a clear end to the sequence.
Review the response
Review delivery and responses before expanding your audience. Look for signs that your message needs more context, a simpler next step, or better timing.