## Fix QuickBooks Invoice Email Problems: Desktop & Online ![quickbooks (1)](https://hackmd.io/_uploads/HkWF10Nrbx.png) QuickBooks users often face issues sending invoices due to email settings, software glitches, or network problems. This guide covers troubleshooting for QuickBooks Online and Desktop, with step-by-step fixes to get your billing back on track. ## Common Causes of Invoice Sending Failures Invoices fail to send from errors like incorrect email preferences, outdated QuickBooks versions, PDF converter issues, or firewall blocks. Outlook or Gmail misconfigurations are frequent culprits in Desktop, while Online users see "undeliverable" statuses from bad customer emails. Browser extensions and admin mode also interfere. ## QuickBooks Desktop: Update and Email Setup Start with basics to resolve most Desktop sending blocks. - Go to **Help > Update QuickBooks Desktop**, select **Mark All** and **Get Updates**. Restart after installing. - Edit **Preferences > Send Forms > My Preferences**, choose **Outlook** or **Web Mail**, enter credentials, and test. - Right-click QuickBooks icon > **Properties > Compatibility**, uncheck **Run as administrator**. Restart. - Run **Fixmapi.exe** (search in C:\Windows\System32) to repair email components. Test by emailing a sample invoice via **Customers > Send Forms Email**. Call **866-798-4134** if persistent. ## QuickBooks Online: Verify Settings and Status Online issues often tie to company or customer email configs. - Settings (gear) > **Account and Settings > Sales > Messages**, confirm sender email is valid. - Invoices list > Check **Status column**; "Not Sent" or "Undeliverable" flags bad recipient emails—update customer records. - Disable browser extensions/pop-up blockers; use incognito mode or switch browsers (Chrome recommended). - Gear > **Export Data** for backup, then try **Save and Send**. For bulk issues, use **Invoice > Main tab > Send** after verifying products/services are active ## Repair PDF and Program Components PDF failures prevent invoice generation before emailing. - Download **QuickBooks Tool Hub** from Intuit. - Run **Program Problems > Quick Fix My Program**, then **PDF & Print Repair Tool**. - In **Control Panel > Programs > QuickBooks**, select **Repair** and restart Rebuild company file if needed: **File > Utilities > Verify/Rebuild Data**. ## Advanced Network and Firewall Fixes Antivirus or proxies block QuickBooks ports. - Windows **Internet Options > Programs > Set Programs > Set default email** to Outlook/Gmail. - Add QuickBooks.exe to firewall exceptions (ports 80, 443, 5937). - Reset **Advanced Connection Settings** to defaults during updates. Run as standard user, not admin, for email stability. ## Prevention and Best Practices Monthly updates prevent 80% of issues. Use consistent email providers; test quarterly. Track via **Audit Log** (Reports). Separate test company file for trials. For law firms or high-volume, integrate billing tools. Need urgent help? Dial **866-798-4134** for live QuickBooks experts. ## When to Contact Support If fixes fail after Tool Hub, consider corrupted files—restore backup. Intuit notes sporadic "can't reach customer" errors despite valid emails; retry or manual PDF attach. Accountant users see more options. ## FAQs ### Why do invoices show "Sent" but not arrive? Spam filters or recipient blocks; check status and customer junk folders. ### QuickBooks won't send from Outlook—fix? Set as default in Preferences; repair MAPI via Fixmapi.exe. ### Online invoice undeliverable for one recipient? Entire batch fails; edit customer email and resend. ### PDF converter error on send? Run Tool Hub's PDF repair; reinstall if needed. ### Browser issues in QBO? Incognito, disable extensions, allow pop-ups. ### Desktop admin mode blocks emails? Uncheck in Properties; run standard user. ### Firewall/antivirus culprit? Whitelist QuickBooks; test with disabled. You can find more detailed insights about [Can’t Open Company File in QuickBooks Desktop](https://quickbooksrepairpros.com/fix-cant-open-company-file-in-quickbooks-desktop/) in this guide. For a deeper understanding of [QuickBooks Error H505](https://write.as/ong28bn7s4weakxq.md), check out this resource.