I tried to send an invoice and I recieved an error prompt: "We couldnt reach some of your customers. Double Check email address"However, the email addresses are correct

Hi there, 

It's vital you're able to send invoices without getting error messages. Don't worry, I'll be happy to assist you with figuring this out. 

First, I'd like to start by doing some troubleshooting to determine if this isn't a browser related issue. When was the last time you cleared cache and cookies on your browser? Doing this will help fix most issues the site may be having. Here's an article which shows you how to do that: How to clear Cache and Cookies. Give this a try and if you're still having issues, I recommend contacting our support team using this link.