I am having the exact same problem - can't send out invoices.

Same issue since 6 AM, same everything! I live in VA, if it makes any difference. 

Widespread error that has clearly slowed business for all users. The Troubleshooting is a wild goose chase and the workarounds are not practical. Here's hoping for a subscription credit due to our loss of workhours spent on this.

I am having the same issues. Can't send invoices. I have templates that I use and haven't changed anything with my invoices but all of a sudden am receiving the Delivery Issue error. Adding my 2 cents to the thread hoping to receive notification when the issue is fixed. 

Hello everyone. 

We're aware that some QuickBooks Online (QBO) users are currently having a problem sending invoices to their customers. Our engineers are working to fix it as soon as possible.

As a workaround, you can download the invoices as a PDF and attach them to an email outside QBO. Please know that if you opt for this workaround, you'll need to manually apply the payment to the invoice once you receive it from your customer. 

We’ll share updates as soon as we learn more. You may also check for updates on your end from time to time through this link: https://status.quickbooks.intuit.com/

Thank you for your understanding while we're working on a fix.

Email payment receipts also not working since this morning.

What happened to make this suddenly stop working?

same issues  here. I am manually emailing forms.

I am also having the same issue.  I haven't changed anything on my invoices and they aren't sending.  If QuickBooks expects me to manually download and send all my invoices,  you can refund my subscription payment since the product doesn't work.   I only use it to send invoices.  

Please refund my monthly subscription payment. 

Estimates are also not sending, same for statements.

Same issue here. 

Same thing. Cannot send invoices, estimates or anything else. I realize I can send the invoice as a PDF but that doesn't negate the fact that a check takes a week to get here if the customer even owns checks. It would be cool if we could get this fixed sooner than later so we can get paid. I literally spent hours trying to figure this out as well

Once the problem is fixed, then the invoice will go to customers directly or do we need to resend? Please confirm

As a twist, I get a pop up message when trying to send receipts to customers.  However, when I try to send invoices I do not.  The only reason I know these are not sending is because I have myself CC'd on these invoices and I've received nothing.  Super weird that one process tells me it's not working and the other doesn't when they both come from the same sales module.

I am also having this same issue. Everything worked great yesterday and now I cannot send invoices or estimates to any of my customers. 

Having the same problem all day.  

Going on almost 10 hours of trying to send invoices and getting back a delivery server down error. 

Is there an ETA for when this Delivery Server Down issue will be fixed? We aren't able to send invoices, estimates, or purchase orders. It has essentially shut our entire business down until the issue is resolved.

Down here too. Is there ETA for when this will be fixed??

If we follow the advice on how to send the invoices manually, then customers won't be able to pay online by clicking the pay now button, right?

Now that we've all worked around the issue all day, what happens to those items that we thought were sent but actually weren't?  Will those ultimately get sent out?  If so, then our customers are going to be receiving multiple emails for a single transaction.  Ugh.... This makes us look stupid. 

Same issue, all day long, being experienced by all of our users. Nothing is being sent: estimates, statements, invoices... everything is coming back with the same "Delivery Error: Delivery Server Down" 

Clients need to pay by CC so their orders can be processed... this delay is definitely not good for businesses.. Will Intuit give us a refund for all the money we are losing because of their problems? I seriously think they should!!!

I am having the issue both when sending invoices as well as POs with attachments

Hello all, does anyone know if this issue has been fixed yet? Experienced it yesterday too