What to Do If QuickBooks Closes While Sending Emails. If QuickBooks crashes while sending emails, it may be caused by an outdated QuickBooks version or improper email configuration. First, update QuickBooks to the latest version. Ensure your email settings are correct, and check for any conflicts with your antivirus or firewall software. Try running QuickBooks in safe mode or reinstalling it to resolve software conflicts. For further help, contact QuickBooks customer support. https://ekonty.com/blogs/38312/Learn-How-to-Send-Emails-in-QuickBooks-Desktop-Instantly