You have created an invoice, checked the amount, and entered your customer's email address. But when you select Send, QuickBooks displays an error, fails to connect to your email provider, or leaves the invoice undelivered. For a business that depends on timely payments, this can delay collections and disrupt the normal billing process.
The Unable to Send Invoices in QuickBooks problem can have several causes. QuickBooks Desktop may have incorrect email preferences, an Outlook configuration issue, or a problem connecting to a webmail server. QuickBooks Online may display a delivery-server error because of an incorrectly formatted email address, an attachment, or a problem with the email-delivery process.
The right solution depends on the QuickBooks product you use and the exact error message displayed.
This guide explains how to troubleshoot invoice email failures, check your email settings, resolve common delivery problems, and verify that your customer receives the invoice.
Why Can't I Send Invoices in QuickBooks?
Before changing settings, determine whether the invoice itself is affected or whether only the email-delivery process is failing.
Common causes include:
- Incorrect email address: The customer's email address or the company's sending address may contain a typo or an invalid format.
- QuickBooks email preferences: The selected email method or account settings may be incorrect.
- Outlook configuration problems: QuickBooks Desktop may be unable to communicate properly with Outlook.
- Webmail connection errors: QuickBooks may be unable to connect to your email provider's server.
- Outdated software: An outdated QuickBooks release or incompatible email application can contribute to sending problems.
- Attachment problems: A large, damaged, or unsupported attachment may interfere with invoice delivery.
- Email provider security restrictions: Your email provider may require updated authentication or security settings.
- Temporary delivery-service issues: QuickBooks Online may experience a temporary problem while attempting to send a sales form.
- Network or firewall restrictions: Security software or network settings may interfere with an email connection.
Do not assume that every invoice-sending error has the same cause. An Outlook error requires a different approach from a QuickBooks Online delivery-server error.
Before You Start: Identify Your QuickBooks Version
Use the section that matches your product.
QuickBooks Desktop with Outlook: Start by checking the Outlook application, QuickBooks email preferences, and product updates.
QuickBooks Desktop with webmail: Review the selected email account, server information, and supported security settings.
QuickBooks Online: Check the invoice recipient's address, the company email address, attachments, and the specific delivery error.
If the invoice is saved successfully but cannot be emailed, you may be able to download or print it and send it through your regular email application while you investigate the issue. Confirm that you do not accidentally send the same invoice twice.
How to Fix Unable to Send Invoices in QuickBooks Desktop
Method 1: Update QuickBooks Desktop
An outdated QuickBooks release can contribute to compatibility or email-sending problems. Check for available updates before making advanced changes.
- Open QuickBooks Desktop.
- Select Help.
- Choose Update QuickBooks Desktop.
- Open the Update Now tab.
- Select the available updates you need.
- Choose Get Updates.
- Close and reopen QuickBooks when the update finishes.
- Try emailing the invoice again.
The exact menu labels may differ slightly by product version. If QuickBooks is managed by your organization, follow your administrator's update procedures.
If the problem persists, move to the email method you use.
Method 2: Check QuickBooks Email Preferences
QuickBooks Desktop supports different ways to send forms, including supported Outlook and webmail configurations. If the selected email method is incorrect, QuickBooks may fail when you try to send an invoice.
Follow these steps:
- Open QuickBooks Desktop.
- Select Edit, then Preferences.
- Choose Send Forms from the left panel.
- Open the My Preferences tab.
- Review the selected email option.
- Confirm that the intended email account is selected.
- Save any appropriate changes and test the invoice again.
If you use webmail, check that the selected account matches the email address you intend to use. If you use Outlook, continue with the Outlook-specific checks below.
Do not enter random server names or change security settings simply to make the message disappear. Use the configuration supported by your email provider.
Method 3: Troubleshoot QuickBooks Desktop With Outlook
If QuickBooks displays a message such as “QuickBooks is unable to send your email to Outlook,” investigate the connection between QuickBooks Desktop and Outlook.
Step 1: Confirm Outlook Works Independently
Open Outlook and confirm that you can sign in and send a test email directly from Outlook.
If Outlook itself cannot send messages, resolve that issue first. QuickBooks may depend on Outlook's working configuration to send invoices.
Step 2: Confirm Outlook Is the Selected Email Method
In QuickBooks Desktop, open Edit → Preferences → Send Forms.
Verify that Outlook is selected as the email method when you intend to send invoices through Outlook.
Step 3: Review the Outlook Profile
Check that Outlook is using the correct email account and profile. If you have multiple Outlook accounts or profiles, make sure the intended account is active.
If Outlook displays a sign-in, authentication, or profile error, follow Microsoft's supported troubleshooting instructions.
Step 4: Check for Office Updates or Compatibility Problems
If the problem started after an Office or Outlook update, record the Outlook version and the date the issue began. Check whether your QuickBooks and Outlook versions have a documented compatibility issue.
Avoid uninstalling Office or changing Windows registry settings as an initial troubleshooting step.
Step 5: Test Invoice Delivery
Return to QuickBooks and email a test invoice to an address you control. Confirm that the message arrives and that the invoice attachment opens correctly.
For additional help, consult Intuit's official guide to fixing QuickBooks email errors with Outlook.
Method 4: Check QuickBooks Desktop Webmail Settings
If you use webmail rather than Outlook, QuickBooks must be able to connect to the email provider using supported account and server settings.
Step 1: Open Send Forms Preferences
In QuickBooks Desktop, select Edit → Preferences → Send Forms.
Select the relevant webmail account and choose the option to edit its settings, if available.
Step 2: Verify the Email Address
Check the email address carefully for spelling mistakes, extra spaces, or an outdated account.
If you recently changed your email password or security settings, verify that the account remains authorized to send messages through QuickBooks.
Step 3: Review the Server Information
If your version displays server or connection settings, compare them with the current configuration provided by your email service.
Do not copy settings from an unrelated provider. Server names, ports, encryption requirements, and authentication methods differ between email services.
Step 4: Check Security and Authentication
Some email providers restrict connections from older applications or require specific authentication methods. Follow the provider's current security instructions.
Avoid disabling account security or using an unverified workaround to bypass an authentication error.
Step 5: Test the Connection
Save the supported settings and attempt to send the invoice again. If QuickBooks still cannot connect to the email server, note the exact message rather than repeatedly changing the configuration.
See Intuit's guidance for fixing an error connecting to the email server.
Method 5: Check the Invoice Recipient and Attachment
Sometimes QuickBooks can send other emails successfully but fails with one particular invoice. In that situation, check the invoice details and attachment.
- Open the affected invoice.
- Verify the customer's email address.
- Check for spelling mistakes, spaces, or an incorrect address.
- Review the attached invoice or any additional files.
- If you added supporting documents, try sending the invoice without optional attachments.
- If the simplified email works, investigate the attachment or file size.
- Restore only the necessary attachments and test again.
Before sending, verify that the invoice contains the correct customer name, amount, due date, and payment details.
If you export the invoice to PDF and send it manually, confirm that the PDF contains the complete invoice and that it is being sent to the correct recipient.
How to Fix Unable to Send Invoices in QuickBooks Online
QuickBooks Online has a different invoice-delivery process from QuickBooks Desktop. If you see a delivery error, check the invoice, email addresses, attachments, and company settings.
Method 1: Verify the Company Email Address
An incorrectly formatted company email address can interfere with invoice delivery.
- Sign in to QuickBooks Online.
- Open Settings.
- Select Account and settings.
- Open the Company section.
- Review the company email address.
- Correct any obvious formatting errors and save the changes.
Make sure the field contains an email address in the expected format. For example, billing@example.com is a normal email-address format, while email:billing@example.com includes an unnecessary prefix.
If you use locations or other company-level email fields, review the relevant address as well.
Method 2: Verify the Customer's Email Address
Open the affected invoice and check the recipient field.
Confirm that:
- The address is spelled correctly.
- There are no extra spaces or unintended characters.
- The address belongs to the intended customer.
- The customer has not requested a different billing address.
If the email address is correct, try sending the invoice to another address you control for testing. Do not use confidential customer information in a public troubleshooting post.
Method 3: Check Attachments and Invoice Delivery Errors
If QuickBooks Online displays Delivery Server Down or another delivery-related message, inspect the invoice and any attachments.
Try the following:
- Confirm that the invoice is saved.
- Check the recipient and company email addresses.
- Remove optional attachments temporarily.
- Retry sending the invoice.
- If it sends successfully, review the removed files and add back only what is necessary.
- If it still fails, record the full error message and follow the product-specific instructions.
A delivery error may be related to attachments or email configuration, so repeatedly clicking Send may not help.
For the current product-specific steps, read Intuit's guide to fixing the Delivery Server Down error in QuickBooks Online.
Method 4: Check Whether the Problem Affects One Invoice or All Invoices
This simple test helps narrow down the cause.
- Only one invoice fails: Check that invoice's recipient address, attachments, and details.
- All invoices fail: Review the company email settings and the overall delivery service.
- Invoices fail only for one recipient: Verify that recipient's address and ask whether the mailbox can receive messages.
- The error appears intermittently: Record when it occurs and check whether the issue persists before changing configuration settings.
If other invoices send successfully, avoid changing company-wide settings unnecessarily. Focus first on the affected invoice and its recipient.
Method 5: Retry After Checking the Error Message
If your company email address and invoice details appear correct, wait briefly and try again if the error suggests a temporary delivery issue.
Do not repeatedly send the same invoice without checking its status. If the first attempt succeeded but the confirmation was delayed, another attempt could create duplicate messages and confuse the customer.
If the error continues, record the message, the time it occurred, and whether attachments were included. Contact the appropriate product support channel if the delivery service appears to remain unavailable.
What If QuickBooks Creates the Invoice but Does Not Send It?
An invoice can exist in QuickBooks even when its email has not been delivered. Creating, saving, sending, and receiving an invoice are separate events.
Before trying again:
- Open the invoice and confirm that it was saved.
- Check the invoice's email or delivery status if your product displays one.
- Review the error message from the previous attempt.
- Check your email's sent folder when using Outlook or webmail.
- Ask the customer whether the invoice arrived, if appropriate.
- Retry only after you have established that the invoice was not successfully delivered.
If you need to collect payment promptly, you can use a verified alternative method, such as downloading the invoice as a PDF and sending it from your regular email application. Confirm the invoice is accurate and avoid duplicate sends.
Common Mistakes to Avoid
When troubleshooting QuickBooks invoice delivery, avoid these common mistakes:
- Changing every email setting at once: Change only settings that relate to the error you see.
- Using incorrect server details: Obtain current connection settings from the email provider.
- Disabling security features: Do not weaken email or computer security just to bypass a connection error.
- Ignoring attachments: An invoice may send successfully when an optional attachment is removed.
- Assuming a saved invoice was emailed: Verify the sending status and recipient delivery.
- Sending the same invoice repeatedly: Check the previous attempt before resending.
- Reinstalling QuickBooks immediately: Identify whether the issue is with QuickBooks, Outlook, webmail, or the online delivery process first.
- Ignoring the exact error message: The wording often points toward the correct troubleshooting path.
Frequently Asked Questions
Why am I unable to send invoices in QuickBooks?
Possible causes include incorrect email preferences, Outlook problems, webmail authentication issues, an incorrectly formatted email address, attachment-related errors, or a temporary delivery-service issue. The appropriate fix depends on your QuickBooks version and error message.
Why can't QuickBooks Desktop send invoices through Outlook?
QuickBooks Desktop may be unable to communicate with Outlook because of incorrect email preferences, a problem with the Outlook profile, an application compatibility issue, or an Outlook sign-in problem. Confirm that Outlook works independently and that it is selected in QuickBooks' Send Forms preferences.
Why does QuickBooks Online show Delivery Server Down?
This error may be related to the invoice's attachments or the company's email configuration. Check the company and recipient email addresses, try sending without optional attachments, and follow Intuit's product-specific troubleshooting guidance.
Can I send a QuickBooks invoice without using the built-in email feature?
You can often save or download an invoice as a PDF and send it through another email application. Verify that the PDF is complete, the recipient is correct, and the invoice has not already been delivered.
Will updating QuickBooks fix invoice-sending problems?
An update may resolve certain software or compatibility issues, but it will not necessarily correct an invalid email address, an authentication problem, or a delivery-service issue. Check the error message and use the troubleshooting steps that match it.
Should I reinstall QuickBooks if invoices will not send?
Reinstallation should not be the first step. Check email preferences, Outlook or webmail connectivity, invoice details, attachments, and available updates first. Consider repair or reinstallation only when there is evidence of a program-installation problem and simpler methods have failed.
Conclusion
When you are unable to send invoices in QuickBooks, start by identifying whether you use QuickBooks Desktop with Outlook, QuickBooks Desktop with webmail, or QuickBooks Online. Check the exact error, verify the recipient and company email addresses, review the relevant settings, and test whether attachments are affecting delivery.
Avoid repeatedly resending invoices or changing security settings without understanding the cause. If the invoice is saved but email delivery continues to fail, preserve the invoice and use a verified alternative delivery method when necessary.
For more QuickBooks troubleshooting resources, visit Data Service Team. For assistance with QuickBooks Desktop email settings and related technical issues, contact Data Service Team at +1-(888)-718-7888.