How many follow-ups, and how far apart

Most replies do not come from the first message. That is the single most useful thing to know about cold email, and it is also the reason most cold email fails: the sender writes one good message and never sends the second.

How many

Three is the number that survives contact with reality. One is optimism. Two is most of the benefit. Three catches the person who meant to reply and forgot. Beyond three you are not following up, you are pestering, and the reply rate you gain is smaller than the reputation you spend.

How far apart

Measure every gap from the first message, not the last one. If day three slips to day five, the day-seven message should still go on day seven — otherwise a single late send pushes the whole sequence out and the thread goes cold while you are still technically following the plan.

What each one says

• The opening earns its reply by being specific. One true sentence about their work beats three about yours.
• The nudge should be shorter than the opening. Nothing new to say is fine — you are not making a better case, you are catching a different moment.
• The close gives them permission to say no. Most people will not, and some of those will say yes instead.

When to stop early

The moment they reply. Anything else is a machine talking over a person. A follow-up that arrives after a reply is the clearest possible signal that nobody is reading — and it costs you the conversation you just won.

Automated or by hand

A sequence that fires on a schedule will eventually send a follow-up to someone who replied by phone, or on the day their company announced layoffs. A due date that waits for you costs ten seconds and never does that. Which trade you want depends on volume, but below a few hundred a month the ten seconds is cheap.