Can someone help me fix the pending delivery issue when I send emails

Hi nskbjwall-icloud,

Welcome to Community!  It's essential that you're able to send estimates to your customers seamlessly in QuickBooks Online.  I'd be happy to point you in the right direction, so you can get the support you need!

The information you've provided is not the outcome we'd expect, and for this situation I recommend contacting us outside of Community.  Our Customer Care team will have the ability to work with you directly and escalate the unexpected behavior for further investigation, if needed.

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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If you have any other questions, please don't hesitate to reach out again.  We'd be happy to help!