Hi Ben! Great question.

When emails are sent via an email integration (like Outlook) through Decile Hub, they sometimes don't appear in your Sent folder. This is a known limitation - when Hub sends through your email provider, it can receive a "success" response from Outlook even if the email didn't sync back to your Sent folder.

Here are a few things you can try to verify:

• Check Hub's activity log for that contact in your pipeline - if it shows as sent there, it was likely delivered
• Check if the recipient responded or opened the email - any engagement would confirm delivery
• Contact the recipient directly if it's important to confirm receipt

If you're still uncertain, feel free to send me a private chat with the prospect's name and we can investigate further on our end!