“If you haven’t sent them an email yet, send an email as soon as you leave them the voicemail—give them more than one way to get back to you. Example 1: “Hi John, this is Aaron Ross from Salesforce.com. My number is 555-555-5555. John, I sent you an email a couple of days ago and hadn’t heard back, and I was hoping you could give me a quick courtesy response. I’ll resend it here in a minute. Again, Aaron Ross, 555-555-5555. Thank you and have a great day.” Example 2: “Hi John, this is Aaron Ross from Salesforce.com. My number is 555-555-5555. John, I’m calling to follow up on the email I sent you, I’d love to hear either way if you can please help me out or not. Again, Aaron Ross, 555-555-5555. Thank you and have a great day.” Example 3: (the mysterious version): “Hi John, this is Aaron Ross following up. My number is 555-555-5555. I’m free after 3pm today. Again, Aaron Ross, from Salesforce.com, 555-555-5555. Thanks and have a great day.”