Many QuickBooks users frequently encounter problems when attempting to send invoices and statements to their customers. Oftentimes, when users try to send these documents via QuickBooks using email services such as Outlook or Yahoo, they encounter an error message that says, QuickBooks is unable to send your emails to Outlook.” If you are facing this issue as well, we have compiled a comprehensive set of instructions that you can follow to pinpoint the causes and resolve the problem quickly. Please read through the entire article for detailed guidance on troubleshooting the error related to QuickBooks’ inability to send invoices or the issue of QuickBooks not being able to send email invoices.