(Updated 11/30/2015) Our engineers are working on this issue.  

We are aware of an emerging issue that is effecting some QuickBooks Online users. These users are receiving a “Delivery server down,” error message when attempting to send invoices, estimates or purchase orders.

If you are being impacted by this issue,

Resolution for '1269965 issue: 'Whenever I attempt to send an invoice, estimate or purchase order in QuickBooks Online, I get the error message “Delivery server down.”' available: Yes.

The 1269965 issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the 1269965 issue yourself by looking for a resolution described in the article. If it is a complex 1269965 issue or you are unable to solve the issue, you may contact us by clicking here or by using other 1269965 support options.

For more information about resolving issues related to 1269965 in Quickbooks/QBO or to get support for the issue 'Whenever I attempt to send an invoice, estimate or purchase order in QuickBooks Online, I get the error message “Delivery server down.”', click the link below: