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4 Tactics for Fixing QuickBooks Delivery Server Down Error

Author: Steve Wood
by Steve Wood
Posted: Oct 30, 2025

Users of QB Online frequently complain that the QuickBooks delivery server is down error.

Occasionally, the problem arises when a user attempts to send invoices. This article will go over how to tackle the QuickBooks delivery server outage issue. The attachments on your transactions, or the configuration of your business email address, have been linked to the problem. This blog post outlines the best methods for resolving the QBO delivery server down problem.

What Causes QuickBooks Delivery Server Outages?

All of the valid causes of the delivery server down problem in QBO are explained in the sections below:

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

  • This problem may arise if the email address format for the location listed on the sales form is incorrect

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

  • The server may encounter issues while attempting to apply the regular authentication method if the sales form email settings are incorrect

  • More processing power is needed from the server when zipped invoice files larger than 25 MB are present. This could lead to failure when sending these files to customers

Practical Steps for Resolving QuickBooks Delivery Server Down Error Online

Check the email address format to resolve the QuickBooks delivery server down error. So just look at it once and seek their help.

Step 1: Check your email address format
  • First, you need to open the Settings menu

  • Move to Account and settings> hit on the company option

  • Find & move to Contact info, need to verify both the company & customer-facing emails. Just like discussed below:

    • Incorrect: email:mycompany@mycompany.com

    • Correct: mycompany@mycompany.com

Step 2: Verify the location's email address
  • You need to access the Settings

  • After selecting All lists, select Locations

  • Be aware of the place you utilize on the invoice

  • In the Action column, open the dropdown menu and choose Edit

  • Check the box next to This location uses a different email address for customer communications

  • Verify your email address and make any necessary changes in the area above.

  • Save the sales form, then attempt to send it again

Step 3: Check the email configuration in QuickBooks
  • Navigate to Settings

  • Navigate to Account and Settings, followed by Company

  • Choose Edit in the Email column after opening the Communications tab

  • Enter your password and email address, then double-check the other information

  • After finishing, choose Save and Done

Step 4: Check the Email Sales Form Option
  • Navigate to Settings

  • Select Accounts and Settings, followed by Sales

  • Check or uncheck the option to attach a PDF when you open Online Delivery

  • Select Save and then Done

Summary In this blog, we have mentioned all the essential information regarding the QuickBooks delivery server down error. By using them, you can easily remove this issue. However, if you are unable to perform the task, you should call +1-(855)-955-1942 to connect with a specialist, who will handle your queries instantly. FAQs on QuickBooks Delivery Server Down Error

Q1. What does the "QuickBooks Delivery Server Down" error mean?

The "QuickBooks Delivery Server Down" error typically appears when you try to email invoices or sales forms from QuickBooks Online (QBO). It indicates that QuickBooks cannot connect to the delivery server due to incorrect email configurations, invalid file names, or oversized attachments.

Q2. Why does the QuickBooks Delivery Server Down issue occur?

This error can occur for several reasons, including:

  • Incorrectly formatted company or customer-facing email addresses.

  • Wrong email format in location settings on invoices.

  • Use of special characters in invoice filenames.

  • Incorrect sales form email settings in QuickBooks.

  • Attempting to send large or zipped attachments exceeding 25 MB.

Q3. How can I fix the QuickBooks Delivery Server Down error?

You can resolve the issue by following these steps:

  • Verify your email format under Account and Settings> Company> Contact info.

  • Check your location’s email address under Settings> All Lists> Locations.

  • Review your email configuration in Account and Settings> Company> Communications.

  • Adjust the email sales form option by navigating to Settings> Account and Settings> Sales.

Q4. How do I check if my email address is formatted correctly in QuickBooks?**

Go to Settings → Account and Settings → Company → Contact Info, then verify that your email is in the correct format. For example:

Incorrect: email:mycompany@mycompany.com

Correct: mycompany@mycompany.com

Q5. Can large invoice attachments cause the QuickBooks delivery server down error?

Yes. If your invoice attachments are zipped or larger than 25 MB, QuickBooks servers may fail to process them. Try reducing file sizes or sending attachments separately to avoid the issue.

Q6. How do special characters in file names trigger the delivery server down error?

Special characters such as / \? % * : | " in invoice filenames can cause the server to reject the email. Rename the invoice or attachment using only letters, numbers, and underscores to prevent errors.

Q7. What should I do if my email configuration settings are incorrect?

Navigate to Settings → Account and Settings → Company → Communications, select Edit, and re-enter your email address and password. Verify the details, click Save, and try sending the email again.

Q8. How do I adjust the Email Sales Form settings in QuickBooks Online?**

Go to Settings → Account and Settings → Sales.

Scroll to the Online Delivery section.

Toggle the option to attach PDF as needed.

Click Save, then Done to finalize changes.

Q9. What if the QuickBooks delivery server error persists after troubleshooting?

If the problem continues even after verifying your settings and correcting email formats, contact QuickBooks Support at +1-(855)-955-1942 for expert assistance. They can guide you through advanced troubleshooting and resolve server-related issues.

Q10. Does the delivery server down error affect my company data or transactions?

No. This error only impacts your ability to send emails or invoices. Your QuickBooks data, customer information, and transactions remain safe and unaffected.

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Author: Steve Wood

Steve Wood

Member since: Jun 25, 2025
Published articles: 6

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