The follow-up sequence that does most of the work

Most people send one email, hear nothing, and conclude the prospect is not interested. Usually the prospect was just busy.

Silence is rarely a no

The first email arrives at a random moment in someone's day. It gets buried, or read at a bad time, or noted and forgotten. None of that means no.

A sequence exists to catch the moment the first message missed. This is the cheapest improvement available in outbound, because it extracts more from contacts you already have.

How many, and how far apart

Three to five touches over a few weeks works well. The spacing should widen as it goes, not tighten:

Every message adds something

"Just following up" gives the reader nothing and quietly asks them to feel guilty. Each touch should carry a new angle: a different aspect of the problem, a relevant example, or a question that is easy to answer in one line.

A sequence is a conversation that unfolds, not the same request repeated louder.

The break-up message

The last email closes the loop politely and says you will stop. It reliably produces replies, because people respond to a door closing. Done without guilt-tripping, it often surfaces a genuine "actually, this is relevant, just not this month."

Know when to stop

A sequence needs an ending. Stop when the planned touches are done, and stop immediately if someone asks not to be contacted. That request is honoured at once and the contact comes off the list.

Silence is not permission to continue forever. Contact hygiene is part of doing this professionally, and in Europe it is also a legal obligation.

Automated or written by hand

Both. Automate the baseline so nothing is forgotten, and write by hand where it matters. Fully automated sequences read as mechanical, fully manual ones do not survive any real volume.