Fix the Delivery Server Down error in QuickBooks Online

Learn how to fix the error Delivery Server Down in QuickBooks Online.

The error Delivery Server Down is usually related to attachments in your sales or invoice when sending it to a customer. Or, it may depend on how you set up the company's email address. Use these steps to fix the error and send your transaction with attachments.

Check your email address format

Check your company and customer-facing email address

Make sure your company email and all customer-facing email fields are complete, have the correct format, and don't have prefixes.

Check your invoice format

Open the invoice you tried to send and make sure it doesn’t have special characters (! @ # $ % ^ & * ( ) _ - = + : ") on the following info:

Check your sales forms email option

Update the attachment setting when emailing sales forms.

Check print and PDF settings

Make sure the file you're attaching isn’t a ZIP file and the size doesn’t exceed 25 MB. If the file name has special characters, remove them.

Check your Adobe Acrobat or Reader settings

Set up the following print options on your Adobe Acrobat or Reader.

Settings for Windows:

Check your browser's PDF setting

After checking your print and PDF settings, try to resend your sales form.