Analysing & Fixing QuickBooks Delivery Server Down Error

When sending invoices or sales forms to your customers, you may encounter the 'QuickBooks delivery server is down' error, which won’t allow you to email invoices and forms. 

You may be shown the following messages on your device display: 

“Delivery Server Down”

[or]

“We’re Unable to Deliver Your Email”

When you’ve violated the company email format, improper invoice format, and incorrect browser configurations or PDF settings. The best part is that you can eliminate this issue with various procedures, as mentioned in the upcoming segments. 

Are you experiencing issues with the delivery server? Just contact our specialist at +1(855)-738–0359, and you will be under the best guidance to resolve this as soon as possible.

Why Do You Receive a Delivery Server Down in QuickBooks?

The following details outline every potential cause for the QuickBooks delivery server down an issue that could occur in QB Online:

• You will not be able to connect to the QBO server if your company and customer-facing email addresses are not formatted correctly

• This problem may be caused by an incorrectly formatted email address for the address supplied on the sales form

• If the invoice filename contains special characters, the server may misunderstand it and refuse to deliver it

• When the server attempts to apply the regular authentication procedure, incorrect sales form email settings could lead to issues

3 Quick Fixes for QuickBooks Delivery Server Down Error 

Occasionally, you may have an immediate need to send invoices to your clients, and you may not have enough time to resolve the QuickBooks delivery server issue completely. In such cases, you can go through the following tactics to send invoices to your clients instantly: 

Fix 1:  Check the email addresses of your company & customers

• Select the Account and Settings tab from the Settings menu in the QB Online window

• Next, pick the Contact info option after selecting the Company icon

• The company email and the customer-facing email should then be confirmed. The following is the typical format:

• You can successfully send your invoices after confirming the company email and the email addresses of the people who will be interacting with customers

Fix 2: Check the location's email address format. The Sales Form

• Click on the Settings menu after opening your QBO account

• Next, select the Locations option from the All Lists menu

• After locating the location you used on your invoice, select the Action column

• To select the Edit option, use the dropdown menu

• The email address displayed in the following field should now be confirmed: "This location has a different email address for dealing with clients."

• If necessary, you can modify the email address. Next, submit the invoices to your clients by clicking the Save button

Fix 3: When emailing a Sales Form, change the attachment settings 

• In your QBO, go to the settings menu and select the account and settings option

• After that, select the sales >  then choose the online delivery icon

• Then, mark or clear the box that contains the PDF attachment and click the save button

• After this, finally, you will be able to send the sales through email

Conclusion

Going through the steps, you can rectify the QB delivery server down error. During this process, if you find that this error is not fixed, you can surely connect with our specialist, and your query will be resolved on a priority basis. Dial +1(855)-738–0359. 

You should also know:- How To Fix QuickBooks Error?

FAQs About QuickBooks Delivery Server Down Error

What does the QuickBooks Delivery Server Down error mean?

• This error occurs when QuickBooks is unable to connect to its email delivery server. As a result, users are blocked from sending invoices, estimates, or other sales forms. It’s usually caused by formatting issues, incorrect settings, or temporary connectivity failures.

Why am I seeing the message “We’re Unable to Deliver Your Email” in QuickBooks?

• This message often appears when email addresses used on the sales form or in company settings are formatted incorrectly. It may also indicate that the delivery server failed to authenticate your email or could not process the attachment properly.

Can incorrect email address formatting cause this error?

• Yes, improperly formatted email addresses, especially those in company info or customer contact fields, are one of the leading causes. Even an extra space, missing character, or misuse of symbols can stop the server from sending your message.

Does the invoice filename affect the delivery server?

• Absolutely. If your invoice filename contains special characters like @, #, %, or symbols that the server does not recognize, the delivery may fail. Renaming the file to a simpler, cleaner name often solves the problem.

How do I fix the delivery server error by editing email address settings?

• You can go into the Account and Settings section in QuickBooks, verify your company and customer-facing emails, and make sure they follow a standard email format. Also, ensure there are no typos or improperly used prefixes like “email:” before the address.

Is the location email address relevant to this issue?

• Yes, if you’re using location-based settings in your sales forms, the email attached to that location must be valid and properly formatted. A mismatch between the sales form and location email can cause the server to reject the message.

Can PDF attachment settings affect email delivery in QuickBooks?

• Yes, PDF delivery settings play a crucial role. If the setting to attach a sales form as a PDF is not configured correctly, QuickBooks may fail to send the form. Adjusting this option in your Sales > Online Delivery settings often resolves the issue.

Does internet connectivity impact this delivery error?

• A weak or unstable internet connection may prevent QuickBooks from connecting to the delivery server. Ensuring that your network is working properly is essential for sending emails successfully.

Can this error be fixed without contacting support?

• In most cases, users can resolve the error by checking and correcting their email formatting, sales form settings, and attachment preferences. However, if the problem persists, professional support can ensure deeper technical issues are addressed.

Is this error limited to QuickBooks Online only?

• While more common in QuickBooks Online, similar delivery issues may also occur in Desktop versions when using integrated email features. The causes are often the same—misconfigured email addresses or server issues.

What should I do if none of the fixes work?

• If you’ve tried updating email settings, checking file names, and adjusting delivery preferences and still face issues, it’s best to reach out to QuickBooks Support. You can also call +1(855)-738–0359 to speak directly with a specialist who will guide you through advanced troubleshooting steps.

How can I avoid this delivery server error in the future?

• To prevent this error, always double-check email fields for proper formatting, avoid special characters in filenames, keep your software updated, and maintain stable internet connectivity during transactions. Regularly reviewing your settings can also help prevent future disruptions.