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It Is Your Responsibility to Follow Up - Alexey Guzey

- Follow up three times, then move on. Suppose you send an
Stephanie Palmer • Good in a Room
What (if anything) do I need to do to follow up?
Gorick Ng • The Unspoken Rules: Secrets to Starting Your Career Off Right
four or five days, send them a follow-up email. If they don’t respond to your first follow up, you can send one final message if they are a particularly good prospect. If they don’t respond to your third message, you should move on to the next prospect.
Matthew Paulson • Email Marketing Demystified: Build a Massive Mailing List, Write Copy that Converts and Generate More Sales (Second Edition)
I don’t recommend following up more than four times. So three days after the first email, you haven't heard back from the client.